Docooler B5 Bluetooth audio transmitter. 

Key features include: 

1.Allows devices like TVs, PCs, and DVD players to transmit audio wirelessly via Bluetooth.

2.Utilizes Bluetooth 4.0 technology.

3.Powered by USB, eliminating the need for batteries or charging.

Features an external antenna for extended range and stable signal transmission.

4.Equipped with AEC echo cancellation and ANC noise cancellation.

Offers high-quality stereo sound with A2DP & AVRCP support.

5.Simple plug-and-play operation, requiring no drivers.