Feature: 1. 2 in 1: Turn old wired devices into BT smart devices in seconds, switch dual signals at will, receive (RX) and transmit (TX) as one, suitable for multiple devices. 2. Transmitter Mode: Wirelessly transmit sound from a non BT TV, home stereo system or CD player to a BT headset or speaker. 3. Receiver Mode: Wirelessly transmit sound from a BT enabled mobile phone, tablet or computer to a wired stereo, speaker or headset. 4. BT 5.0 Stable Output: To achieve a high degree of restoration of high quality music, while the signal is not easy to disconnect in a complex interference environment. 5. Built In Battery: The BT 5.0 transmitter receiver has a built in 200mAh large capacity rechargeable lithium battery, which can be used while charging. 6. Scope of Application: Compatible with most BT protocol products on the market, widely used in computers, laptops, tablets, home stereo systems, earphones, smart phones, MP3 players and CD players, etc. Specification: Item Type: BT 5.0 Transmitter Receiver Model: RX-TX-19 Material: ABS Colour: Black Battery Type: Built In 200mAh Lithium Battery (Included) BT Version: V5.0+EDR Technology: BT5.0, AVRCP (Receiver Mode Only), A2DP BT Normal Distance Range: Approx. 15m/49.2ft (Without Obstacles) Response Frequency Range: 10Hz-20KHz Interface: Stereo Analog AUX3.5mm Performance: HiFi Level Pairing Name (Receiving Mode): RX-TX-19 Transmitter Mode: Red LED Light is On Receiver Mode: Blue LED Light is On Applicable Models: Compatible with Most BT Protocol Products on the Market, Widely Used in Computers, Laptops, Tablets, Home Stereo Systems, Earphones, Smart Phones, MP3 Players and CD Players, etc.. Package List: 1 x BT Transmitter Receiver1 x 3.5mm Cable1 x RCA Cable1 x Data Cable1 x Manual Note: RX and TX cannot be activated at the same time, only one of the two