Feature: 1. Portable wireless audio transmitters and receivers are good wireless audio solutions for all situations and conditions. 2. In transmitter mode, audio from a non‑bluetooth TV, stereo or CD player to a bluetooth headset or speaker, in receiver mode, wireless audio from bluetooth‑enabled phones, tablets or computers to wired stereos, speakers or headsets. 3. Switch between transmitter and receiver mode with the simple flick of a swatch and connect easily with the latest bluetooth technology and 3.5mm/0.1in audio cable (included). 4. It has powerful wireless audio streaming function and portable, you can put these transmitters and receivers in a backpack or laptop bag and carry them with you to everywhere. 5. This receiver transmitter adapter can be widely used in your computer, laptop, stereo, headset, smartphone, MP3 player, CD player, etc for its extensive compatibility. Specification: Condition: 100% Brand NewItem Type: Bluetooth 5.0 Audio Transmitter ReceiverColor: As Picture ShownLength: Approx. 44mm/1.7inWidth: Approx. 44mm/1.7inHeight: Approx. 12mm/0.5inWeight: Approx. 78.0g/2.8ozModel: KN321 Technologies: BT5.0, A2DP, AVRCP (receiver mode only) Operation Range: Up to 10m / 33ft (without any blocking objects) Pairing Name:KN321 Charging Time: 2 Hours Battery Type: Li-Polymer (200mAh) . Package List: 1x Bluetooth 5.0 Audio Transmitter Receiver 1x Micro USB Power Cable 1x RCA Cable 1x 3.5mm Aux Cable 1x User Manual