Shark Sharktooth 2.1 Bluetooth Kit for Shark Helmets Special Features Fits Shark Evoline ST Helmets Paired devices (max.8) Multipoint 3 profiles max (1 hands free 1 A2DP 1 intercom) Incoming alert from other device when connected Stereo music streaming Next/previous remote command for A2DP (music player mode) Full duplex Full DSP noise cancellation/echo cancellation Automatic volume adjustment depending on ambient noise and speed level Easy to find volume/multi-point functions Digital volume control Voice recognition dialing (if phone supports) VOX command Receive or reject incoming calls by voice control Waterproof Aerodynamic and compact shape Easy to install, compatible with most common helmets available on the market Talk Time Up to 10 hours Mobile Phone Up to 10 hours Intercom Up to 10 hours streaming A2DP Stereo Music Standby Time Up to 700 hours/1 month Charging Time 4 hours Battery Type 2.4 GHz Bluetooth Compliance Bluetooth version 2.1 Supported Bluetooth Profiles A2DP Advance Audio Distribution Profile / SBC Stereo Streaming Video Remote control/AVRCP Audio Operating Range Up to 10 meters Phone range in hands free/A2DP Up to 400 meters intercom Frequency 2.4GHz