Doosl Bluetooth Receiver, [20 Hours] Bluetooth Music Portable Receiver Adapter with 3.5mm Output and a USB Cable for Portable Speakers, Home Stereo, and Car Music Sound Systems. Bluetooth Receiver, convenient to control, You just need to connect the Bluetooth Receiver to the devices that are equipped with 3.5mm audio port, and match the Bluetooth with your mobile device, then to enjoy your favorite music. Inner 400mAh Li-battery, Operation Time is up to 20 HOURS, Stand by Time is 400 HOURS, and it can be easily recharged via Micro USB cable. Designed of unique appearance and made of high-quality materials, super clear conversation effect. Three touched buttons for smoothly operating, and the built-in soft light will not cause distraction in car, safe for driving. Bluetooth Car Kit, Compatible with car stereos, home stereos/speakers, headphones etc. most mobile devices with 3.5mm AUX port.