Specification: Item Type: Bluetooth Transmitter Receiver_x000D_Material: ABS_x000D_Model: BT-22_x000D_Bluetooth Version: 5.1_x000D_Bluetooth Name: BT-22_x000D_Effective Open Distance: Approx.15m / 49ft_x000D_Performance: Stereo HiFi Level_x000D_Battery Capacity: 200mAh Li-ion Battery (included)_x000D_Working Hours: RX 8h, TX 5h_x000D_Frequency Response Range: 10Hz-20kHz_x000D_Signal To Noise Ratio: 110dB_x000D_Product Function: Receiving + Transmitting + Call 3 in 1 Features: 1Dual Modes and Functions: Rich interface design, dual receiving and transmitting modes, rich interfaces, easy switching. The functions include receiving + transmitting + call 3 in 1. 2Stable Connection: With the latest Bluetooth chip and well designed software, upgrade your old equipment to Bluetooth function without replacement, but also promises to give you a CD like auditory feast. 3Working Hours: 8h for RX mode, 5h for TX mode. Built in 200mAh Li?ion battery (included), it can support Bluetooth adapter once fully charged to provide long time use. 4Intelligent Charging: When in a low battery state, the adapter can be plugged into the power supply for charging while working. Work while charging, allowing you to enjoy more fun. 5[Universal Compatibility] This Bluetooth 5.1 receiver transmitter is very suitable for home theater, stereo and car speakers, as well as smart phones, and for Android devices. PackageList: 1 xBluetoothTransmitter Receiver 1 x 3.5mm Cable 1 x Type C Charging Cable 1 x RCA Cable 1 x Manual