Headband Headset Specification: USB charge: DC 5V IN FM Frequncy: 87.5-108MHz Bluetooth frequency: 2.401-2.480GHz Bluetooth distance: 10 meters Frequency:50HZ-20KHz Output power:35mW SNR:88DB Charging time: 2hours Headband Headphone Features Driver unit:40mm diameter Support Bluetooth 4.1 version downwards Compatible with 4.1 version Scope of work:10 meters USB charging cable: AC input 110-240V DC input 5V Talk time: 6hours Standby time: up to 15 hours Operating frequency: 2.4GHz-2.4835GHz The output frequency:class2 Noise reduction technology: DPS digital signal processor Support A2DP function AVRCP remote control capabilities Supports automatic switchover to incoming call function With the end number redial function Large and small volume adstment Forward backward selections feature pause function Compatible with ROHS standards Casque Audio Package includes: 1 X P47 Bluetooth Headphone 1 X USB Cable