Feature:1. For RCA and I2S audio input/output interfaces, can be switched freely.2. Two antennas, Bluetooth use distance more than 80M/262.5ft, strong stability.3. HiFi lossless sound quality, ultralow delay sound output. Support for aptx LL/ APtx/ SBC/AAC/ FS.4. Charging time about 2.5 hours, RX mode for more than 10 hours, TX mode for more than 8 hours.5. Exquisite and compact design, easy to carry and use. Suitable for TV, PC, Car and headphones.Specification:Item Type: Bluetooth AdapterMaterial: ABSColor: As Pictures Shown Weight: Approx. 162g/5.7ozModel: B2Bluetooth Protocol Support: RXA2DP AVRCP TXA2DPTransmission Distance: > 80m/262.5ft (barrier-free)Battery Capacity: 500mAhBattery Type: Lithium BatteryWorking Hours: RX> 10 Hours, TX Averaged > for 8 HoursCharging Time: About 2.5 HoursCharging Voltage: DC 5VInput/output Connection Mode: for RCA, 3.5mm Stereo Audio InterfaceAudio Codec: aptX Low Latency, Aptx, for SBC, AAC (RX).Package List:1 x Receiver1 x Manual1 x Charging Cable1 x 3.5mm Cable1 x 3 in 1 Connecting Cable