The SRL2 Bluetooth® intercom system was originally created by Sena and SHOEI for the SHOEI GT-Air II helmet. The SRL2 is built with similar functions to the top-of-the-range Sena 20S, but with a simple 3-button control. Connect the SRL2 to your smartphone so you can listen to music, GPS directions, talk on the phone and much more. Built with dual Bluetooth chips, the SRL2 lets you communicate with up to 7 other riders at a distance of 1.6 km (1 mile) in open country. Audio Multitasking™ lets you listen to music and talk with other riders over the intercom at the same time. The clever design will automatically lower the music volume when someone starts talking and then raise it again once you finish your conversation. The SRL2 comes with all the functions you need for the smoothest ride, including group intercom, voice commands and more. Universal Intercom™ makes the SRL2 compatible with other, non-Sena Bluetooth communication systems. The SRL2 is also built with Advanced Noise Control™, so whether you are talking over the intercom or making a phone call, ambient wind and road noise does not interfere with the sound. Connect the SRL2 SHOEI communication system to the Sena Utility app (for iPhone and Android) to configure the device's settings and access the Quick Start Guide at the push of a button. The SRL2 also connects to the Sena RideConnected app, so you can easily talk over the intercom with an almost unlimited number of riders over an infinite range while connected to a mobile network. GENERAL - Talk time: up to 10 hours - Operating temperature: -10?C ~ 55?C (14 ° F ~ 131 ° F) - Charging temperature: 0?C - 45?C (32 ° F - 113 ° F) Dimensions: - Speaker: 31,9 mm driver unit - 4,4 mm thick - Boom microphone: 55 mm long - Wire between speakers: 85 mm long Weight: main unit - 100 g (3,53 oz) BLUETOOTH - Bluetooth 4.1 - Headset Profile (HSP) - Hands-Free Profile (HFP) - Advanced Audio Distribution Profile (A2DP) - Audio Video Remote Control Profile (AVRCP) INTERCOM - Working distance: Up to 1,6 kilometres (1,0 mile) in open country - Supports up to 8 riders AUDIO - Noise cancellation: Advanced Noise Control™ - Codec: Built-in SBC Codec FM RADIO - Radio frequency specification: 76 ~ 108MHz - 10 preset station memories BATTERY - Charging time: 2,5 hours - Type: Lithium polymer battery CERTIFICATION - CE, FCC, IC