Xiaomi Roidmi New Device:
1) Smart Car Charger Roidmi 3S (BFQ04RM)
2) Bluetooth 4.2 (32-bit)
3) FM Transmitter
4) Music Streaming
5) Support fast car charger
6) Car Charger with Dual (2) USB Ports
7) GPS Navigation Audio
8) Automatic Device Connection
9) Smart App Control
10) Stainless Steel Electrode Connector
11) Compatible with all Smart Phones and most Cars in North America
12)1-year manufacturer limited replacement warranty

App:
1) Integrates with Music Streaming Services
2) Music App Auto-Start
3) Navigation Audio broadcast
4) Background Noise Elimination
5) FM Frequency Scanning (87.5 – 107.9 MHz)
6) Car Battery Monitor
7) USB Ports LED Lights Color Adjustments
8) No separate Remote Control needed

Guide:
1) Download Roidmi App (Google + Apple)
2) Insert Roidmi Device into Cigarette Lighter Socket
3) Open Roidmi Driver App and pair Smart Phone with Roidmi Bluetooth Device
4) Use Roidmi Driver App to scan and select any open FM Frequency
5) Set car radio FM Preset Button to selected FM Frequency
6) Stream Music from Smart Phone
7) Use Roidmi Driver App to adjust settings for all Features
8) Plug-in Smart Phone and any other USB device to Dual Ports Car Charger

Technical:
1) Input: 12-24V, 0A-2.4A
2) Output: 5V, 2.4A, 3.4A
3) Output interface: Dual USB
4) Output Power: 15.5W (max)
5) Operative standard: Q/WXRM001-2015
6) Bluetooth profile: Dual mode V4.2 (BR/EDR)
7) Bluetooth protocol: HFP/A2DP/AVRCP/EDR/SPP/BLE
8) App supports iOS V8.0 + Android V4.2 or later