2pcs Professional Football Referee Intercom full duplex 1200M Referees headset Wireless BT Intercom Interphone This headset is specially designed for referees of football and handball. Referees wear a single ear headset to get the real time news of the game, this headset support them to run freely but also hear a clear sound even the surrounding is noisy. This kit includes referee headset and V6 intercom, the headset works with the intercom very well. Referees can hear the sound clearly even the surrouding is noisy, V6 helps referee to talk in 1200m range, perect for a football field. Features: Between 2 referees talking on the field Max talking range: 1200m/3937feet between 2 referees Max working speed: Up to 120Km/h Talking time: Up to 8 hours Standby time: 100 hours Frequency: 2.4GHz Bluetooth Core: Bluetooth 3.0 Battery: 550 mAh Li Polymer battery Charging time: About 3 hours Chip brand: CSR Power supply: AC 110V~240V Power output: DC 5V 55~75mA Highlights: BluetoothMotorcycle helmetintercom withtalking range up to1200 meters Full Duplex Wireless Bluetooth Handsintercom commnunicate Up to Pair 6 Riders Talk Between Any 2 of them at a time With Wind noise DSP cancellation ,you could hear clearly at a speedup to 120km/h High quality batteries , 3 hours charge to full andUp to 8hours talking time WithStereo Bluetooth Headset,supports stereo music/Audio navigation from GPS , Auto answerthecall. Ultrasonic integral molding,Better water resistance,could be used inall weather. Hands communication.you can pair with other 5 persons. Suit for motorcycle helmet (Full-face / Half-face) Works good with referee headset for football match(3-4pcs to make a referee group) Package included: 2 x 2 x Referee headset 2 x Armband bag 2 x USB cable 1 x User manualPackage Includes:Package Includes: 2 x V6 Plus 2 x Referee headset 2 x Armband bag 2 x USB cable 1 x User manual