Item Type: Bluetooth 5.0 Transmitter ReceiverMaterial: ABSBuilt In Lithium Polymer Battery: 220mahSensitivity: -42dBWorking Distance: Approx. 10m/32.8ftBluetooth Standard: 5.0Bluetooth Protocol: HSP, A2DP, AVRCPInput/Output Port: 3.5mm Audio JackTransmission Rate: 100 (Mbps)Package List1 x Bluetooth Transceiver Receiver1 x Charging Line 1 x Audio Adapter1 x DescriptionRX receiving mode, (toggle switch must be executed at shutdown)(this applies to all audio devices with audio input interface) TX transmit mode: (toggle switch must be executed when shutdown ) (This mode works with TVS, players, etc., and wirelessly transmits sound to Bluetooth receiving devices such as Bluetooth earphones or bluetooth speakers.) 1Superior Performance: Compatible with smart Bluetooth 5.0 built in noise reduction and high fidelity sound quality; 10m/32.8ft stable transmission signal; Fully compatible with automatic matching. 2Car Audio: Connect the B12S to the smartphone and insert the 3.5mm audio cable into the car. You can use car stereo to enjoy music, make phone calls, listen to music, more convenient and safer. 3Wireless Transmission: Traditional audio connects to AUX audio interface or RCA audio interface, which can transmit wirelessly even without Bluetooth capability. Transceiver 2 in 1, plug and play, no drive. 4Stable Transmission: Equipped with Bluetooth 5.0 chip, can realize stable connection, fast transmission, wide signal range. One button operation, switch on and off, answer and hang up. 5Two in One: In transmitter mode, convert nonBluetooth TV, PC, CD player, MP3, MP4 to Bluetooth transmitter. Receiver mode: Ideal for home or vehicle music streaming sound system.