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 Material: ABS + Metal Built-In Lithium Battery: 850mAh Maximum Intercom Distance: Approx.800m/0.5mile Chip: CSR BC5 Talk Time: About 29 Hours Standby Time: About 260 Hours Charging Time: About 3 Hours Speaker Power: 0.12W Working Voltage: 3.3-4.2V Working Temperature: -10-50 Waterproof Rating: IP65 Connection Method: Bluetooth Maximum Number of Speakers: 2 Applicable Helmet Types: Universal, Open Helmet, Lifting Helmet, Full Face Helmet, Off-Road Motorcycle Helmet Maximum Support: Full Duplex Intercom for Two Drivers, Six Drivers Stereo Music/Audio: A2DP and EDR Bluetooth Phone/MP3/GPS/Hi-Fi Bluetooth Version: Bluetooth 3.0 How to Use: 1. Connect the headset to the intercom 2. Turn on the bluetooth connection 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.