Bluetooth Version: V4.0 Bluetooth Range: Up to 30 feet Power Supply: inner 250mAh Li-Battery charging via Micro USB cable Compatibility: car stereos, home stereos/speakers, headphones etc. by 3.5mm stereo inlet socket Operation Time: up to 16 hours (built-in battery) music playback or continuous with Micro-USB charger Product Size：5.2X2.5X1cm N.W：15g

Doosl® 2nd Gen Mini Bluetooth 4.0 Receiver
The Doosl 2nd Gen Bluetooth V4.0 Receiver is special designed for the most devices with 3.5mm AUX port, such as car stereos, home stereos/speakers, headphones etc. 
It is easy to use, just plug it into the audio devices mentioned above, and match the Bluetooth with your mobile phone. 
Then, you can listen to the music from your mobile phone without any cables. 

The Bluetooth V4.0 Receiver is a safe, easy and hands-free product for you to listen to the music through your car stereo. 
It will make your traveling more relax and interesting. It is the optimal accessory for you while driving. 

Convenient to control 
Super clear conversation effect 
Inner Li-Battery, over length battery working time 
Built-in soft light, it will not cause distraction in car 
After a successful match, this device will automatically complete the Bluetooth match when you switch it on next time. 
Support iPhone, iPad, mobile, laptop and other devices with Bluetooth function