Bluetooth Transmitters features: Bluetooth5.0 Wireless Transmitter Receiver 3.5mm AUX NFC to 2 RCA Audio Adapter Color: we send based on the color or size of the main image of the product page. Quantity：we send based on quantity on title, if there is no quantity in the title, we send based on description. Specifications Technologies: BT5.0,a2dp avctp avdtp avrcp hfp spp smp att gap gatt rfcomm sdp l2cap (receiver mode only) Operation Range: Up to 15m / 50ft (without any blocking objects) Pairing name(Receiver mode ):Bluetooth Music Transmitter mode: blue LED light is on Receiver mode:white LED light is on Dimensions: 105mm*65mm*25mm Parameters: Interface: stereo analog AUX3.5 mm Performance:HiFi level Bluetooth Version: 50 Decoding Chip: Bluetooth 5.0 Effective Distance: 10 m Audio: Signal-to-noise ratio: >110 db Frequency response range: 10 hz - 20 KHZ Output Impedance: 75 ohms Noise + Distortion: < 0.02% Package Content 1x NFC BT19 5.0 Audio Transmitter/Receiver Adapter 1x 3.5mm Aux Cable 1x User Manual 1x AV Audio Cable 1x type-c Charging power cord