Yison Bluetooth Headphones Hanker-H3 PRODUCT DETAILS: Model: Hanker-H3 Wireless version : V5.0 Working frequency: 2402-2480MHz Transmission distance: 10m Best working distance: <5m Frequency response: 20HZ-20KHZ Battery capacity: Lithium battery 3.7V/350mAh Music time : About 18 hours Call time: About 18 hours Standby time : About 400 hours Input voltage: Micro USB/DC 5V /500mA Charging time: About 2.5 hours