Features: 1.With automatic answering function, automatic reception of mobile phones, the speed is up to 120 km/h, and the conversation can last for 29 hours, freeing your hands and ensuring safe riding. 2.3.5mm audio input, suitable for stereo music on any GPS or MP3 mobile phone equipped with Bluetooth. Can be used with external media players (eg MP3/portable CD). 3.The 800m/0.5mile intercom can be widely used, is really suitable for motorcycle helmets, snowmobiles, snowboards, beach bikes. 4.When you are not riding a bicycle, it also can be used as a bluetooth headset and wireless music headset, very useful. 5.This bluetooth intercom is compact and convenient. The plastic and rubber materials are stable and have IP65 waterproof. Specification: Item Type: Bluetooth Intercom_x000D_ Material: ABS + Metal_x000D_ Built-In Lithium Battery: 850mAh_x000D_ Maximum Intercom Distance: Approx.800m/0.5mile_x000D_ Chip: CSR BC5_x000D_ Talk Time: About 29 Hours_x000D_ Standby Time: About 260 Hours_x000D_ Charging Time: About 3 Hours_x000D_ Speaker Power: 0.12W_x000D_ Working Voltage: 3.3-4.2V_x000D_ Working Temperature: -10-50_x000D_ Waterproof Rating: IP65_x000D_ Connection Method: Bluetooth_x000D_ Maximum Number of Speakers: 2_x000D_ Applicable Helmet Types: Universal, Open Helmet, Lifting Helmet, Full Face Helmet, Off-Road Motorcycle Helmet_x000D_ Maximum Support: Full Duplex Intercom for Two Drivers, Six Drivers_x000D_ Stereo Music/Audio: A2DP and EDR Bluetooth Phone/MP3/GPS/Hi-Fi_x000D_ Bluetooth Version: Bluetooth 3.0_x000D_ How to Use:_x000D_ 1. Connect the headset to the intercom_x000D_ 2. Turn on the bluetooth connection_x000D_ 3. You can use Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.