Bluetooth Receiver & Transmitter 2 in 1 Bluetooth gives TX/RX modes. With TX mode, it can transfer audio from your Bluetooth-incompatible TV to your Bluetooth devices, such as a transmitting headset. With RX mode, it can be the audio from your Bluetooth devices, such as transferring a phone to a stereo device that turns off Bluetooth. If you want to change the mode, you don't need to turn off the power. Bluetooth Hands-free Calling In receiving mode, this product supports Bluetooth hands-free calling. When a call comes in, press the multi-function key to answer the call; During a call, press the multi-function key to hang up; Once connected, double-click the multi-function key to redial after the call ends. Wide CompatibilityBluetooth adapter with the included 3.5mm cables, this receiver transmitter adapter can be widely used on your computer, laptop, home stereo, headphones, smartphone, MP3 player, CD player, etc. Auto Re-PairingJust press the switch, set it to the desired mode, you can quickly and easily establish a connection. An internal battery ensures that the bluetooth adapter can be used for up to 8 hours and immediately connects to already paired devices. bluetooth transmitter receiver with wider compatibility, faster transfer speed, better sound quality. 250mA Lithium-ion Battery & Portable Design Adopting the long-lasting 250mA lithium-ion battery, it can play continuously for more than 8 hours while being fully charged in about 2 hours. Free use of the cable, the maximum wireless distance is 10 meters. The compact Bluetooth adapter is small, light and easy to carry. Bluetooth transmitter and receiver without external driver installation. Product parameters: Bluetooth version: 5.0 Working frequency band: 2.402GHz -2.480GHz Power class: Power Class 2 (Class II) Audio codec: SBC Working current: RX 22MA TX 35MA Built-in battery: 250MAH Charging current: about 200MA Charging time: about 2 hours Battery life: RX>12H, TX>7H Bluetooth distance: 10M (open space) Charging method: Micro USB 5V/0.5A Input/output connection method: AUX interface Compatible: Android, IOS system mobile phones and PADs, and Bluetooth speakers or headphones that support the A2DP protocol are connected for use. Product size: 52*52*13mm Product weight: 75g Color: Black Number of pieces delivered: 1 piece become very rich