1、EASY TO USE: You only need to use the 0.138in adapter (included) to connect it to the car's auxiliary (AUX) port to enjoy the wireless Bluetooth function. 2、INSTRUCTIONS: Use the Bluetooth search function of the mobile phone to pair with the transmitter. Use it for your favorite music, videos, or hands‑free calls. The sound quality is clear. 3、LONG STANDBY: The transmitter can be fully charged in 30 minutes, the use time is up to 4 hours, and the standby time is up to 150 hours. 4、COMPATIBLE PRODUCTS: Compatible with car stereos and headphones with 5 mm audio input. With clip on attachments. The built in microphone reduces background noise while driving. 5、SINGLE BUTTON DESIGN: With a single button design, you can answer calls and play, pause audio and video. It will automatically connect to the last paired device, no need to set up repeated use. 1 x Bluetooth Receiver1 x 3.5mm Adapter1 x USB Charging Cable1 x Description Item Type: Bluetooth ReceiverMaterial: ABSTransmission Rate: 100 (Mbps)Battery: Lithium Compound (Built in) Model: 502030 Capacity: 200mAhParameter: 1. Bluetooth V 4.1+EDR, Long Transmission Distance 10m 2. Support Bluetooth Hands free Call Function 3. Support Bluetooth A2DP 4. Frequency: 2.4GHz 5. 3.5mm Stereo Input Jack 6. Sleep Mode, Energy Saving 7. Power Supply: Charge With Mini USB Cable 8. Working Time: Can Work Continuously For 3-5 Hours