The MultiSet includes two ready-to-use SCALA RIDER Q2 wireless headsets for hands-free and safe bike-to-bike communication at distances of up to 540 yards as well as for use with mobile phones. Features General Talk time up to 8 hours Standby time 10 days Weight 1.18 oz 33.5 gr Battery type rechargeable Li-Po Charging time 3 hours Rugged Design Rain and snow resistant Certificates FCC, IC,CE, Bluetooth Bluetooth version 2.0, class 1 Bluetooth Profiles Headset, Handsfree mono Chip manufacturer Cambridge Silicone Radio CSR Intercom Bike-to-Bike intercom communication up to 1,640 ft. 500 m range full duplex in wide open terrain Rider-to-Passenger communications up to 33 ft. 10 m range with all scala-rider models full compatibility Audio Noise cancellation Microphone AGC technology Automatic Volume Control according to speed VOX technology Accept or Reject calls by voice commands Speaker Booster Functional Fit to full and 34 Helmets Quick-release mechanism for headset Two ultra-slim speakers 4.7 mm 0.18 in. 4 large control buttons Hands-Free Profiles Voice dial Last-number redial Call reject FM Radio 87.5 MHz to 108 MHz receiver 6 Station memory with Search and Store functions Automatic radio muting incoming calls Radio On time typical 8-10 hours Charger 110240V 5060Hz Universal Travel Charger