K21 Wireless Bluetooth 4.1 Business Earphone 300mAh Super Long Standby with Mic
K21 Wireless Bluetooth 4.1 Business Earphone 300mAh Super Long Standby with Mic, Sweatproof, Noise Reduction, Mute Switch for Cell Phone, Skype, Truck Driver,Office,Sport
Product parameters Product Model: K21 Bluetooth Version：V4.1 Working radius: 33ft Charging time:about 2.5 hours Listening to music time: About 24 hours Talk time :About 32 hours The Standby time: About 70 days Battery Capacity: 300mAh Package Contents: 1 × Bluetooth Earphones 2 × Ear Cap 1 × USB Charging Cable 1 × Manual Which functions does the product have? 1.Long endurance 2.Connect 2 devices at the same time. 3.Wear left and right ears. 4.smart switch up and down. 5.Answer/hang up /reject. 6.Telegraph number. Bluetooth signal distance? The Bluetooth signals have an effective distance of 33ft. However,you are expected to use the product within a distance of 9.8ft to 16ft, because the wireless signals transmitted by mobile phones will suffer decline,loss or interference in long-distance transmission and result in discontinuous sounds,a poor sound effect or disconnection(the product will try for re-connection when it is in the effective distance again) .