Features: Exquisite design featuring a CSR high-end chip. One-button switching between RX and TX modes. Built-in 500mA battery for extended battery life. RCA and I2S audio input/output interfaces for versatile connectivity. Dual antennas provide a Bluetooth range of over 80m/262.5ft with strong stability. HIFI, lossless audio quality with ultra-low latency. Supports apt‑x LL/ apt‑X/ SBC/AAC/ FS. Low power reminder when the battery level is below 20%. Automatic sleep mode after 6 minutes of disconnection in RX and TX modes. Equipped with a battery protection IC for safe and reliable charging. Supports Dual Stream (TX mode) for connecting two Bluetooth audio devices. Receiving (RX) mode can connect to two devices simultaneously, selectable from mobile phones, tablets, or laptops. Volume and track control via button presses during playback. Automatic reconnection in both receiving and transmitting modes with memory function for connected devices. Simple connection without the need for drivers or app downloads. Specification: Item Type: Bluetooth Transmitter Receiver Material: ABS Color: As Pictures Shown Weight: Approx. 166g/5.9oz Bluetooth Version: Bluetooth V5.0 Support Protocol: RX: A2DP AVRCP TX: A2DP Operating Frequency: 2.402GHz -2.480GHz Power Level: Power Level 1, 2 (Class I II) Distortion: ≤0.1% Support Dual Stream (TX Mode): Support (one transmitter is connected to two Bluetooth speakers or headphones simultaneously with a CODEC, up to APTX LL) Support Multipoint(RX Mode): Support (connect two phones) CODEC: TX: for apt-X LL/apt-X/ SBC/FS RX: for apt-X LL/apt-X/SBC/AAC/FS APTX Usage Note: apt-X LL CODEC is preferred for easy connection (all devices must also support apt-X LL) Built-in Battery: 500mAh Charging Current: About 350mA Charging Time: About 2.5 hours Endurance: RX is more than 10h, TX averages about 8h Bluetooth Distance: > 80m/262.5ft (no shelter) Charging Mode: Micro USB 5V/ 0.5A Input/Output Connection Mode: for RCA interface, I2S AUX interface, support for RCA and Aux dual-channel simultaneous output Compatible for Android/IOS System Mobile Phone and Pad, and support A2DP Bluetooth speaker or headset connection Use Package List: 1 x Adapter 1 x USB Charging Cable 1 x 3.5mm Audio Cable 1 x for RCA Audio Cable 1 x Manual