Bluetooth connectivity for solo riders Whether you’re commuting to work or primarily ride solo, the SF1 has you covered. The SF1 was created to give solo riders all of the awesome Bluetooth features that they need, without the ones they don’t. The SF1 pairs to your phone allowing for music streaming, taking and making phone calls, and hearing turn-by-turn GPS directions. The SF1 also allows VOX Phone commands. General Talk time: 13 hours Operating temperature: -10?C ~ 55?C (14°F ~ 131°F) Dimensions: Speaker: driver unit 38 mm – thickness 10 mm Wired Boom microphone: length 183 mm Wire between speakers: length 590 mm Weight: Module: 35 g (1.23 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: SF4 - up to 1.2 km (0.8 miles) in open terrain SF2 - up to 800 m (880 yards) in open terrain Audio Advanced Noise Control™ Built-in SBC Codec Wide volume control Sample rate: max. 48 kHz (DAC) FM-Radio Built-in FM radio with RDS AF (Radio Data System Alternate Frequencies) Radio region: worldwide Radio frequency specifications: 64 ~ 108MHz 10 preset station memory with automatic scan function Battery Charging time: 1.5 hours Quick Charge: 30 minutes of charging equals 4 hours intercom Type: Lithium polymer Certificates FCC, IC