Home Tech Xiaomi ROIDMI 3S Bluetooth Music Car Charger and FM transmitter review

Xiaomi ROIDMI 3S Bluetooth Music Car Charger and FM transmitter review

Xiaomi Roidmi charger top


Xiaomi ROIDMI 3S Bluetooth Music Car Charger



The RoidMi car charger is a gadget that every car needs. Especially when you have a slightly older car like the one my wife has, with an integrated radio-cd player without built-in Bluetooth. This transceiver gives you the opportunity to connect your phone and play music or make/receive calls through your radio. Besides this functionality, this device is a powerful fast-charger.

It sounds great, so let’s see if it can live up to its expectations.


  • Brand: ROIDMI
  • Model: 3S
  • Color: Black
  • Input ( Car Charger ): 12 – 24V
  • Output ( Car Charger ): 5V 2.4A ( Max. 3.4A ) / 5V 2.4A ( Max. 3.4A )
  • Apply To Car Brand: Universal
  • Working Temp.(℃): 10 – 60 Deg.C
  • Material ( Cable&Adapter): Stainless Steel


  • Product weight: 0.0320 kg
  • Package weight: 0.0560 kg
  • Product size (L x W x H): 6.50 x 2.60 x 2.60 cm / 2.56 x 1.02 x 1.02 inches
  • Package size (L x W x H): 8.50 x 8.50 x 3.00 cm / 3.35 x 3.35 x 1.18 inches

Does it fit your mailbox?

Check out the package dimensions and it probably fits 🙂
Xiaomi Roidmi charger unboxed Xiaomi Roidmi charger top view Xiaomi Roidmi charger bottom

What’s in the box

Not that much:

  • 1 x Car Charger,
  • 1 x English User Manual

Build Quality and Design

The design is clean and simple. It looks like every USB – car charger that’s available on the market. The feel of the device is solid. The car charger comes in the color black, which is different from the white look that we are used to with Xiaomi products. This makes the car charger easy to blend in.

Check out the photo’s on this page and see for yourself.


In a few steps, you are able to pair your phone with the charger.
Put the charger in your 12V outlet in your car. Tune your car radio to the default frequency (96.4 FM). On this frequency, the transmitter sends the Bluetooth audio to your car radio. Simple but effective. If you let the charger in your car and the Bluetooth on your phone on, you are ready to go, every time you enter your car.

There is an app (RoidMi) which you can download from the app store/play store. With this app, you can change the default frequency in case of white noise on channel 96.4. You can change to any frequency that gives no white noise.

Bluetooth streaming and calling

The setup was very simple and from now on music and calls are forwarded from your phone to your car radio. The quality of the music is good, but it can happen that you need to change the default frequency in some areas.


De RoidMi 3S is equipped with 2 illuminated USB ports. Both can be used to (fast) charge any device. You immediately notice the difference from other car chargers. This one is much and much faster. You have the luxury to charge two devices at the same time because of the dual USB-port. This doesn’t affect the fast charge function, it charges just as fast as when you have plugged-in only a single device.


A Car Cassette adapter with a 3.5 mm (Like my wife used before she discovered the RoidMi 3S.
Click here for some cheap car cassette adapters.

Pro / Cons


  • Intuitive app makes it easy to set up
  • Good audio quality
  • Updatable firmware
  • Small price (currently € 13.12 in Flash Sale)


  • A little delay when you receive a call

Where to buy?

We bought this device from GearBest through this page.

Xiaomi Roadmi app Xiaomi roidmi perfect front view Xiaomi roidmi well designed

  • Design
  • Quality
  • Usability
  • Price


The Roidmi 3S is a great device to add Bluetooth music to your car at a good price.
You’re not only getting a solid Bluetooth FM transmitter but also a fast dual USB charger.
This makes the Roidmi 3S a good purchase for anyone looking for a good bluetooth to FM streamer, a fast USB charger or both.