2 in 1 Bluetooth Transmitter: Bluetooth transmitter supporting dual-stream (TX mode & RX mode). Receiver mode(RX mode, blue light): Transmits audio wirelessly from your Bluetooth-enabled phone, computer to your stereo, speakers or headphones. Transmitter mode(TX mode, red light): wirelessly transmits audio from your non-Bluetooth TV, home stereo or CD player to your Bluetooth headphones (not applicable to Ai-rpods) or speakers. Bluetooth 5.0 adapter: Bluetooth Transmitter/Receiver uses 5.0 technology, provides more stable, faster transmission, lower power consumption, while demonstrating superior sound quality. Bluetooth 5.0 with an audio adapter, the data transfer rate is two times higher than that of Bluetooth 4.2, and it can be kept at a distance of up to 12 meters (without barriers). HD & Low Latency: Equipped with the enhanced Bluetooth 5.0 chipset, the Bluetooth transmitter receiver can deliver stable audio and CD quality which let you experience truly high definition audio. With low latency function, you can watch video while watching movies without delay. Note: Low Latency requires Bluetooth headphones or speakers supported. The low latency doesn't support RX mode. Model: 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) Dimensions: 44 x 44 x 12mm Weight: 18g Package Content: 1 x Blue 5.0 Audio Transmitter 1 x Micro USB Power Cable 1 x RCA Cable 1 x 3.5mm Aux Cable 1 x Multilingual instruction manual