The SENA SMH5D FM Bluetooth Dual Pack Kit was designed to easily snap on and off of user s helmets.7 hours of Talk Time with 6 days stand byHeadset Profile (HSP) and Hands-Free Profile (HFP)Advanced Audio Distribution Profile (A2DP)Audio Video Remote Control Profile (AVRCP)Bluetooth 3.0 Intercom700 meters working distance (760 yards) in open terrainAdvanced Noise Control with wind noise reductionBuilt-in SBC Codec with wide volume controlSample rate: 48 kHz (DAC)Built-in FM radio with Radio Data System Alternate Frequencies10 pre-set station memory with automatic scan functionLithium polymer Battery charges in 2.5hoursCertificates - CE, FCC, ICThe SENA SMH5D FM Bluetooth Dual Pack Kit includes a Quick Clamp which allows the unit to be quickly and effortlessly installed and then transferred between helmets ideal for motorcycle training courses, tours or rentals. In addition to the simple installation, the jog dial and large intercom button on the SMH5 MultiCom make for an intuitive u