Features:
[Transmission Function]
You can
connect the Bluetooth Transmitter to the audio devices without Bluetooth
function via the 3.5mm audio jack, changing these audio devices into
Bluetooth-enabled audio devices. In this way, you can enjoy music in
your earphone or speaker.
[Receiving Function]
It can
change the traditional car system and home audio system into
Bluetooth-enabled ones. Once the Bluetooth Receiver connected with
speaker with 3.5mm audio cable, you can enjoy music from your phone
wireless.  
[Transmitter Application]
Bluetooth Transmitter is specially designed for audio devices such as MP3, MP4, TV, PC, projector, DVD, VCD and STB, etc. 
[Strong Compatibility about Receiver] 
It's
compatible with Bluetooth-enabled smart phones, laptop, tablet and
almost all Bluetooth-enable audio devices with standard 3.5mm audio
jack.  
[Endurance Time]
With built-in 250 mAh Capacity, it
provides 13 hours of TX Mode working time, 9 hours of RX Mode working
time and 260 hours of standby time. Specification:
Bluetooth Version: CSR 4.0

Transmission Power: Class II
Transmission Distance: <=10m ( free space)
TX Mode Working Time: 13 hours
RX Mode Working Time: 9 hours
Standby Time: up to 20 hours
Charging Time: about 2 hours
Battery Capacity: 260 mAh

Package List:
1 * 2 in 1 Wireless Bluetooth Audio Transmitter & Receiver
1 * 3.5mm Aux Line
1 * USB Charging Cable