Multiple Helmets Adaptability: Rider-to-rider intercom communication is compatible with ILM 953 Bluetooth helmet and ILM 902 Bluetooth helmet to meet different communication needs. The TCOM-SC helmet intercom headset is suitable for almost all helmets. Hi-Fi Stereo & Noise Control: DPS echo cancellation and noise suppression technology (DPS: Digital Signal Processor) allows bikers to enjoy crystal clear voice and music from their mobile phone or other Bluetooth device. Durable Battery Life: Support up to 10 hours phone talk time, 7 hours intercom talk time and 300 hours of standby. The battery will enter deep sleep mode when the Bluetooth system hasn’t been used for a long time. To wake the battery up, charge the battery for about half an hour. After this charge, Bluetooth functionality will be restored. Wireless Intercom System: Featured with a intercom system, the motorcycle helmets bluetooth headsets support pairing up to 3 riders, with 2 riders intercom communication at the same time with maximum distance up to 800 Meters (2625 Feet open space) at high speed up to 75mph (120km/h). High Technology: Bluetooth 3.0 offers riders one touch control for calling, answering, rejecting incoming phone calls, listening to Music, FM Radio and GPS navigation audio. The LED screen can display a wealth of information for the convenience of your operation.