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Descriptions This professional referee intercom headsets enable referees to intercom talk with other referees while arbitrating during football games with clear instrction and conversation. Features ① Four users Full duplex Real-Time communication ② No need hot keys, easy to use ③ Memory pairing, simple and easy. ④ Latest chipset from Amercia,HI-FI sound ⑤ High-power headset, which can be used In a noisy environment. Stereo HI-FI headset ⑥ National Level 5 waterproof standard Specification Bluetooth version: Bluetooth 3.0 Chip: CSR BC5 Battery capacity: 550Mah Speaker power: 0.25W RDS: NO Battery type: polymer lithium battery Waterproof grade: National Level 5 waterproof standard Automatic volume adjustment: no Operating voltage: 3.3v-4.2v Talk time: 8h Working temperature: -10-45 degrees Celsius Charging time: 2.5hour Standby time: 150hour Package: 4x V4 referee intercom device 4x refereee earphones 4x Charging Cables 4x Arm bags 4x Instructions Warranty 1 Year(Within 1 year after you purchase, we supply repair service for free) If you need the accessories for this intercom, you can contact wiht us. Note: We have pairing video, if you need, please contact with us to get.