Portable and lightweight, easy to carry.Transmitter mode: wirelessly transmits audio from a non-Bluetooth TV, home stereo system or player to a bluetooth-compatible headset/speaker/receiver.Receiver mode: wirelessly transfer the audio of a Bluetooth-enabled mobile phone, tablet or computer to a wired stereo system, speakers or headphones.Mode Switch:1. If the device is in a certain mode for a long time, you need to power it back twice to switch to another mode.2. If the device has just switched modes and you want to switch to another mode immediately, you only need to reactivate it once.RX mode: please connect the product to the audio device using a 3.5mm audio cable and find the for MSD168 in the bluetooth-compatible settings of the phone for pairing. The blue light flashes during the pairing process, and the blue light stops flashing after the pairing is successful.TX mode: please use 3.5mm audio cable/RCA audio cable to connect the product to TV and other devices, TX mode will automatically search for other bluetooth-compatible receiving devices (such as bluetooth-compatible headset, bluetooth-compatible speaker, bluetooth-compatible receiver, etc.). The red light flashes during pairing, and the red light stops flashing after the pairing is successful.Item Name: bluetooth-compatible AdapterMaterial: ABSTechnology: BT5.0, A2DP, AVRCP (Only for Receiver Mode)Max Operation Range: 10m (Barrier Free)Matching Name (Receiving Mode): for MSD168Transmitter Mode: Red LED Light is onReceiver Mode: Blue LED Light is onFeatures: 2 in 1, Portable, LightweightSize: 3.2cm x 1.7cm x 1.2cm/1.26" x 0.67" x 0.47" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x bluetooth-compatible Adapter1 x 3.5mm Audio Cable1 x User Manual