1. Light to 133 grams, easy to wear, lecture not tired
2. Using 13-core Rutilon speaker, with excellent sound quality, loud volume does not break the sound and not harsh
3. Using digital efficacy system, low distortion, high clarity
4. Noise reduction microphone / noise reduction speaker, no whistling, so that the sound is more dynamic
5. Support insert TF card / U disk, can be used while charging

Parameters:
1. Material: ABS
2. Rated power: 5W
3. Input voltage: DC 3.7V DC 5.0V
4. Li-ion battery capacity: 1500 mA
5. Frequency response range: 40Hz-20KHz
6. Distortion: +/- 1% (3.7V, 1Khz, 1W)
7. Signal to noise ratio: 83dB
8. Playback format: MP3
9. Impedance: 2Ω
10. Operating temperature: -5 ~ 40 degrees Celsius
11. Size: 85 x 85 x 34mm

Package includes:
1 x mini audio speaker
1 x Wired Headset Microphone
1 x Belt
1 x usb data cable
1 x instruction manual