Bluetooth Headphone Headset Wireless Support Memory Card USB Charge: DC5VIN FM Frequency: 87.5-108MHz Frequency: 50HZ-20KHz Bluetooth: 2.401-2.480GHz Working Duration: 5-6 hours SNR: 88 Db Bluetooth Distance: 10m Output power: 35mW Charging time: 2 hours Standby time: 18 hours Driver unit: 40 mm AVRCP remote control capabilities