HIGH QUALITY Built-in intelligent recharging management system for secure battery charging and discharging, fast charging and long play time With microphone input function Exquisite and durable design Apply high strength ABS plastic crust, firm and durable Waist hanging wear style for convenient use SPECIFICATIONS Weight: 138gSize: 4.33*1.5*3.46inchesSound Coverage: 300~400㎡Max Output Power: 5WFrequence response: 90Hz-18KHzCharging Voltage: DC 5V, 500mALithium battery: 1200mAh WIDE RANGE OF APPLICATIONS With high performance and high safety lithium battery, the service life can reach up to 300 times. Compressed technology is adopted to produce, small size and light weight, which is suitable for teachers or tour guides. MORE CONVENIENT When using the microphone, it should be 1-2 cm from the lips. It may be able to cause some interference when the microphone is near the voice amplifier. This is a removable wireless headphone, which with removable ear hook. You can hold it with hands after removing the ear hook or hook on your head. Use whichever style you want