B28 2-In-1 Audio Adapter AUX Connector Bluetooth 5.1 Transmitter Receiver 1.Bluetooth Transmitter & Receiver - In TX mode, Bluetooth transmitter for headphones connects to non-Bluetooth devices (such as airplanes, gyms, TVs, or PCs) to enable Bluetooth functionality and transmit audio. In RX mode, the wireless audio transmitter and receiver connects to wired stereo systems (like car stereos or wired speakers) to add Bluetooth capability and receive audio 2.Bluetooth 5.1 - Bluetooth 5.1 technology ensures more stable connection, lower latency, larger range, lower power consumption, faster transmission 3.Long Playtime - It has a built-in 200mAh battery for longer working time 4.Easy to Use - No need for any driver, no more setting, just plug and connect 5.Universal Compatibility - Compatible with almost any Bluetooth-enabled devices, such as smartphone, PC, smart TV, Bluetooth headphones, Bluetooth speaker, Bluetooth receiver amplifier Specification: 1.Bluetooth version: 5.1 2.Bluetooth connection range: 15m 3.Product interface: 3.5mm audio interface 4.Frequency response range: 10HZ-20HKZ 5.Signal-to-noise ratio: less than 110dB 6.Function: Bluetooth reception + transmission two-in-one 7.Main functions: Bluetooth audio receptiontransmission + call, 3.5 audio input, 3.5 audio output, toggle switch switch 8.Size: 60x20x15mm