1For RCA and I2S audio input/output interfaces, can be switched freely. 2Two antennas, Bluetooth use distance more than 80M/262.5ft, strong stability. 3HiFi lossless sound quality, ultralow delay sound output. Support for aptx LL/ APtx/ SBC/AAC/ FS. 4Charging time about 2.5 hours, RX mode for more than 10 hours, TX mode for more than 8 hours. 5Exquisite and compact design, easy to carry and use. Suitable for TV, PC, Car and headphones. Item Type: BluetoothAdapter Material: ABS Color: As Pictures ShownWeight: Approx. 162g/5.7oz Model: B2 Bluetooth Protocol Support:RXA2DP AVRCP TXA2DP Transmission Distance: > 80m/262.5ft (barrier-free) Battery Capacity: 500mAh Battery Type: Lithium Battery Working Hours: RX> 10 Hours, TX Averaged > for 8 Hours Charging Time: About 2.5 Hours Charging Voltage: DC 5V Input/output Connection Mode: for RCA, 3.5mm Stereo Audio Interface Audio Codec:aptX Low Latency, Aptx, for SBC, AAC (RX) 1 x Receiver 1 x Manual 1 x Charging Cable 1 x 3.5mm Cable 1 x 3 in 1 Connecting Cable