Bluetooth Receiver and TransmitterBluetooth 2 in 1 gives TX/RX modes. With TX mode, it can transfer audio from your Bluetooth-incompatible TV to your Bluetooth devices, such as transmitting headphones. With RX mode, it can be 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 power off the device. Bluetooth Hands-free CallingIn receiving mode, this product supports calls Bluetooth hands-free. When a call comes in, press the multifunction key to answer the call; During a call, press the multifunction key to hang up; Once connected, double click the multi-function button to redial when the call ends. Wide CompatibilityBluetooth adapter with the included 3.5mm cables, this adapter 39;transceiver can be widely used on your computer, laptop, home stereo, headphones, smartphone, MP3 player, CD player, etc. Auto Re-pairing Just flip the switch, set it to the mode you want, 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 transceiver with wider compatibility, faster transfer speed, better sound quality. 250mA Lithium-ion Battery and Portable DesignAdopting the long-lasting 250mA lithium-ion battery, it can play continuously for more than 8 hours while fully charged in about 2 hours. Cable free use, 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: 2.402 GHz -2.480 GHz Power Class: Power Class 2 (Class II) Audio Codec: SBC Operating Current: RX 22 MA TX 35 MA 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 Charging method: input/output connection: AUX interface Compatible: Android, IOS system mobile phones and PADs, and Bluetooth speakers or headphones that support A2DP protocol are connected for use. Product size: 52*52*13mm Product weight: 75g Color: Black Number of pieces delivered: 1 piecea becomeveryrich