JEDA B3509 Bluetooth 4.1 3.5mm Stereo Audio Receiver Transmitter 2-in-1 Chipset CSR8670  Features:<br> Send and receive integrated model， the company uses the most high-end chip csr8670 CSR， (containing lithium battery， sustained for 9 hours)  Specifications:   Bluetooth Transmitter   10dBm RF transmit power with level control from on-chip   6-bit DAC over a dynamic range &amp;gt;30dB    Class 1， Class 2 and Class 3 support without the need for   an external power amplifier or TX\/RX switch     Bluetooth Receiver   Bluetooth Vision:4.1   Receiver sensitivity of -90dBm   Integrated channel filters   Digital demodulator for improved sensitivity and cochannel    Package included:  1 x 2 in 1 Wireless Bluetooth Receiver Transmitter    Pictures presentation:     1x Bluetooth music Transmitter     1x USB charge cable     1x Audio cable     1x RCA cable <br>Pictures presentation: