Perfect for Bluetooth communication between driver and passenger The SF1 Bluetooth communication system is specially designed for direct communication with the pillion rider and therefore offers 2-way intercom communication with a range of up to 100 meters in open terrain. The SF1 can be paired with a smartphone or GPS device to stream music, make and receive calls and listen to navigation announcements. In addition, the SF1 allows VOX phone commands and features audio_Overlay™, battery quick charge and microphone mute. 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