Car Seats
for children 5-50 lbs. / birth-8 years

Sonus Convertible Car Seat (Indigo)


Evenflo's Sonus Essential Convertible Car Seat offers a rear-facing weight rating of up to 40 pounds and a forward-facing weight rating of up to 50 pounds. Featuring a built-in ventilation system that provides traveling comfort for your child through all seasons,try this seat for a top notch extended-use option at an affordable price.


Item No. 34711959

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Additional Information

Go with the Flow...

Rear-facing for infants and when ready, converts to forward-facing to keep your growing child traveling safely and comfortably. Evenflo's Sonus Essential Convertible Car Seat offers a rear-facing weight rating of up to 40 pounds and a forward-facing weight rating of up to 50 pounds. For added comfort, this seat offers a built-in ventilation system that provides traveling comfort for your child through all seasons. Try this seat for a top notch extended-use option at an affordable price.

The Sonus convertible car seat features:

  • Rollover Tested- Evenflo is leading the industry with the development of a dynamic rollover test
  • Air Flow Ventilation System - Offers built-in ventilation system that provides a comfortable seat for your child through all seasons
  • Extended Use- Accommodates your growing child longer with the broadest range of harness adjustments
  • Up-Front Adjust - Easy access harness tension system
  • 5 shoulder strap positions ensure proper fit always

Child Specs (5-50lbs)


  • Weight: 5-40 lbs (2.3-18 kg)
  • Height: 19-40 in. (48-102 cm)
  • Fit: Top of head is at least 25 mm (1 inch) below the top of the child restraint seat back.


  • Weight: 22-50 lbs (10-22.6 kg)
  • Height: 28-50 in. (71-127 cm)
  • Age: At least 2 years old
  • Fit: The tops of the child’s ears are at or below the top of child restraint seat back.

Product & Shipping Specs

  • Dimensions: 29.0 x 19.0 x 19.0
  • Product Weight: 15 lbs.
  • Package Width: 19.125"
  • Package Weight: 14.9 LBS.
  • Package Depth: 19.125"
  • Package Height: 29.625"

Safety Testing

At Evenflo, we continue to go above and beyond government standards to provide car seats that are 2X the Federal Crash Test Standard.

  • Rollover Tested: Evenflo is leading the industry with the development of a dynamic rollover test.
  • Side Impact Tested: Meets or exceeds all applicable federal safety standards and Evenflo’s side impact standards.
  • Designed and tested for structural integrity at energy levels approximately 2X the federal crash test standard.
  • FMVSS 213: Federal Motor Vehicle Safety Standards for Child Restraint Systems
  • FMVSS 302: Federal Motor Vehicle Safety Standards for Flammability of Interior Materials
  • Certified For Use In Aircraft: When used with the internal 5-point harness this restraint meets FAA Inversion requirements for airplane use.

Use & Care

Read all instructions and warnings on the product, product labels, and instruction manuals before use. Consult your vehicle owner’s manual to determine proper placement of child restraint in your vehicle and familiarize yourself with your vehicle’s components.

Browse Instruction Manuals »

Cleaning Instructions
  • DO NOT lubricate or immerse in water any part of this child restraint, unless rinsing is permitted
  • Plastic and metal parts may be wiped clean with mild soap and water and dried with a soft cloth. Do not use abrasive cleaners or solvents.
  • Take care not to damage any labels.
  • The harness can be wiped clean with mild soap and water. Allow harness to air dry.
  • Machine wash the seat pad separately in cold water, delicate cycle. Tumble dry 10 to 15 minutes on low heat.
  • Periodically inspect and clean the restraint's crotch buckle of food, liquids, and other debris to ensure proper latching. Place the buckle in a cup of warm water and gently agitate the buckle back and forth. Press the red button several times while the buckle is in the water. Do not submerge the harness strap. To avoid damage to the buckle, do not clean the buckle with soap or detergents and do not use a lubricant.
Sonus Convertible Car Seat (Indigo) is rated 4.5 out of 5 by 19.
Rated 5 out of 5 by from Great product for the price!! The car seat could’ve felt a bit more sturdy, however it was a great product for the price point. The fabric was soft and my child did not feel hot after sitting in the seat after a long drive. It was easy to install with the instructions being clear and concise. I used it both rear and front-facing with my 2-year old Just to get a feel for the installation on both and found both ways to feel safe a secure! My tot also loves the seat - which is the most important!
Date published: 2017-10-06
Rated 5 out of 5 by from Lightweight, easy to install and clean, comfy! This isn't my first Evenflo car seat and there's a reason for that. With multiple kids, Evenflo is a wonderful product that won't break the bank. This seat in particular is great because it's roomy without being enormous. There are two easy-to-clean cup holders. The fabric is soft and and thick but breathable, and easily removed for washing. Great product!
Date published: 2017-10-10
Rated 4 out of 5 by from I am very happy with this product, it fits my 10 month old son (22lbs) perfectly. The only part I had a hard time with was tightening the strap for the latches that hold the car seat in place. The buckles and harness are easy to snap together, tighten, and loosen and it is easy to get my child in and out.
Date published: 2017-10-12
Rated 5 out of 5 by from I purchased for my grandson. sturdy & well made Riding in comfort with Glamma! Well made and Samuel is one happy Baby Boy!
Date published: 2017-09-06
Rated 5 out of 5 by from Incredible value! As a Child Passenger Safety Technician, I value a safety seat with a straightforward install. As a parent, I value features that make my car seats convenient. Thankfully, this seat offers both! The Evenflo Sonus is a fantastic option for a car seat that will move between cars or used for travel. It's lightweight and could easily be carried onto an airplane for use, and is FAA approved. I installed this seat both rear- and forward-facing and found all installs easily achievable with the LATCH system and with the vehicle seat belt. I was able to get a proper install with less than 1" movement at the belt path in just a couple minutes. The Sonus has a small footprint, meaning it will fit well in even small vehicles. The recline mechanism for rear-facing is easy to engage and disengage, so it isn't difficult to change the seat's orientation from rear-facing to forward-facing. I am also very impressed with the high end features of this seat, especially for it's reasonable price point. There are two cup holders, expertly designed to allow a variety of cup sizes without making the car seat wider. There are buckle holders to keep the harness out of the way when you're putting a child in the seat, so you don't have to dig buckles out from under your child. The cover is plush and looks quite sturdy, where other seats in this price range tend to have simpler covers with less cushion. Overall, I am extremely happy with the Sonus. It has features that are great for travel and also every day use. It is easy to install and use. It's rear-facing limits (of 40" or 40 lbs) will allow most kids to remain rear-facing for around 3 years, which is excellent. It also has high top slots, so it should last a good while forward facing, as well. My 4 year old has one harness slot to go, and based on average torso growth, I anticipate that she will still fit in the seat for about two more years. I haven't gotten to try my almost 7 year old in it yet, but it might even possibly fit her still, as well.
Date published: 2017-10-05
Rated 4 out of 5 by from Great value! This car seat offers good features for the price point. The fabric of the seat is very comfortable and soft. It provides plenty of cushion and has a nice clean look. The pillow is also a nice addition. I wish that it also included harness strap covers because I only purchase car seats that already come with them or have them available from the manufacturer. In this case, Evenflo's website states that harness covers are available but must be ordered from them. It includes 2 cup holders that could easily fit a variety of cups without adding any extra bulk to the width of the seat. The seat also has pockets for the metal harness buckles to slide into to keep them out of the way when getting your kid in and out of the seat. Initial set-up of the seat was easy - re-routing the latch strap into the rear-facing slots, adjusting the harness height, and adjusting the crotch strap location. We installed this seat rear-facing in a 2005 Nissan Altima for our 19 month old son. This is a no frills car seat with basic hook style latch connectors and a level line on the base of the seat that needs to be made parallel to the ground when installed. The level line is just formed into the black plastic of the car seat. It is not easy to see and doesn't stand out in any way. I would've preferred it to at least be in a contrasting color to the plastic since it is an important part of the installation process. The seat installed fairly easily into our car using the latch connectors. We did not end up needing to use any rolled up towels or pool noodles to get the correct position, which was great! Just be prepared to use some serious muscle to get the seat tight enough since these are just basic latch connectors and not the self-tightening kind that higher priced car seats use. We were able to get a very good install with this seat without any real difficulties. Our previous seat was a Safety 1st convertible that never seemed to get a good install and we had to readjust it nearly every time we used it, so the Sonus was a major upgrade for us! Overall, this seat has some great features and is much nicer than other seats I've seen or owned at this price point. I wish it included the harness strap covers, and I will definitely be contacting Evenflo to order some. We were able to get a better install with this seat in our car than with the seat we were previously using. Also, our son rode comfortably in the seat with no complaints. I also really appreciate that this seat has been rollover tested and side impact tested in addition to the other safety tests. This really gives me peace of mind that my kid will be safe. I wouldn't hesitate to recommend this seat to anyone looking for a budget friendly seat with great features.
Date published: 2017-10-20
Rated 4 out of 5 by from Great product for the economic family! I've been using this product for several weeks now and it does not disappoint! The seat is sturdy and brings no safety woes when my child is properly buckled. It fits well in my vehicle and I plan to use it for years to come. I would recommend this product to anyone looking for the next stage carseat for their baby, and you can't beat the price!
Date published: 2017-10-10
Rated 4 out of 5 by from Lightweight yet sturdy. I was a bit hesitant to put my little guy in this seat at first because I am used to seats that are "sturdier" and this is very lightweight. However, I was pleasantly surprised by how well made this little seat really is! It was a breeze to install and I got a great, tight fit right away.
Date published: 2017-10-10
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