Maximum Number of Speakers : 4 Maximum Intercom Distance : 500-1000m Certification : CE Origin : Mainland China Item Type : Helmet Headset Item Weight : 0.4kg External Testing Certification : ce Applicable Helmet Type : Universal Special Function : voice control,Universal Pairing Function,waterproof,Noise Reduction Model Name : V6C Power Supply Mode : Built-in Battery Connection Mode : bluetooth Bluetooth referee intercom headsets with talking range up to 1200 metersFull Duplex Wireless Bluetooth Handsfree intercom commnunicateUp to Pair 4 people &Talk Between Any of them at a timeV4C:FM Radio, never be boring at the part time.WithWind noise DSP cancellation, you could hear clearly at a speed up to 120km/hHigh quality batteries, 3 hours charge to full and Up to 8 hours talking timeWith Stereo Bluetooth Headset, supportsstereo music/Audio navigation from GPS, Auto answer the call.Ultrasonic integral molding, Better water resistance, could be used in all weather.Hands free communication. you can pair with other 3 persons.Suit for motorcycle helmet (Full-face / Half-face)Works good with referee headset for football matchReal time three-way referee intercoms, three people talk at the same timeMax talking range: 1200m/3937feet between 2 peopleMax working speed: Up to 120Km/hTalking time: Up to 8 hoursStandby time: 100 hoursFrequency: 2.4GHzBluetooth Core: Bluetooth 3.0Battery:850mAh Li Polymer batteryCharging time: About 3 hoursChip brand: CSRPower supply: AC 110V 240VPower output: DC 5V 55 75mA Features:What's more, we also send an armband to put the intercom headset, thus, referees could wear the arm band and use the headset much more easier.With this headset, two referees could talk without difficulties in the range of 1200m. Even when they are moving around rapidly, they could hear super clear.This referee headset kit saves money for you, much more affordable than 4pcs V4C, but suppoer 4 people talk at the same time.Perfect to group a 4-people communication team.Xinowy V4C are professional communication tools designed for referees, they work good for soccer referees, football referees, handball referees etc. Package Include: 3 * V4C Referee intercoms 3 * Microphone headsets 3 * USB charging cables 3 * User manuals 1 * bag