Style:Ear Hook Communication:Wireless Connectors:USB Use:Mobile Phones Function:Microphone,Noise Cancelling,Bluetooth Bluetooth Version:Bluetooth v4.1 Frequency response:2.4-2.48 GHz Working time:4-6 hours Standby time:up to 240 hours Charging time:about 2 hours Feature:U8 bluetooth headphones Color:Black, Red Show More