Specifications:It has the latest bluetooth-compatible 5.0 version, and can compatible with specification version 5.0, and backward compatible with bluetooth-compatible 4.2/4.1/4.0/3.0/2.0/1.0.The microphone design allows you to talk hands-free in RX mode or while driving.This bluetooth-compatible 5.0 receiver can be connected to any A/V receiver and any speaker with a standard 3.5mm jack or 2 RCA ports, so it is very suitable for home theater and car stereos, and also suitable for iPhone, for iPad, for iPod Touch, for Android devices and smartphones.Built-in chip, you can directly connect to NFC mobile phones or other devices that support NFC bluetooth-compatible by touching this receiver.With 3.5mm and 2RCA connection options, you can play music on 2 speakers simultaneouslyThis wireless bluetooth-compatible adapter supports a connection of up to 10 meters/33 feet to control long-distance music playback.Using the charger cable to connect the car/other power source, when you start the car or its power source, it will automatically turn on and automatically connect to the device you connected last time, and when the car is turned off, it will automatically turn off.Item Name: NFC bluetooth-compatible Transmitter ReceiverMaterial: ABS, PCBluetooth Version: BT 5.0Distance: 10MPower Supply: DC5V (1-2.1A)Compatible: All bluetooth-compatible Audio Devices, Support A2DP/AVRCP/HFP ProtocolFunction: Support NFC bluetooth-compatible Audio Reception, bluetooth-compatible Audio TransmissionFeatures: bluetooth-compatible 5.0 Version, with Microphone, NFC Support, Dual Audio Ports, Automatic On/OffSize: 6cm x 6cm x 2cm/2.36" x 2.36" x 0.79" (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 NFC bluetooth-compatible Transmitter Receiver1 x 3.5mm Audio Cable1 x USB Power Cord1 x 3.5mm to RCA Cable1 x User Manual