Feature:1. Dual Modes and Functions: Rich interface design, dual receiving and transmitting modes, rich interfaces, easy switching. The functions include receiving + transmitting + call 3 in 1.2. Stable 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.3. Working 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.4. Intelligent 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.Specification:Item Type: Bluetooth Transmitter ReceiverMaterial: ABSModel: BT-22Bluetooth Version: 5.1Bluetooth Name: BT-22Effective Open Distance: Approx.15m / 49ftPerformance: Stereo HiFi LevelBattery Capacity: 200mAh Li-ion Battery (included)Working Hours: RX 8h, TX 5hFrequency Response Range: 10Hz-20kHzSignal To Noise Ratio: ＜110dBProduct Function: Receiving + Transmitting + Call 3 in 1.Package List:1 x Bluetooth Transmitter Receiver1 x 3.5mm Cable1 x Type C Charging Cable1 x RCA Cable1 x Manual