Features:
1. Ergonomic earplug design for comfortable wearing
2. Swappable&rechargeable Li-ion battery
3. Adjustable volume control, balance control
4. Over 120dB output ensure excellent hearing
5. Longer battery opearting time
6. Automatic gain control
7. Noise reduction technology
8. Dual receiver charging ports

Technical specifications
Modulation: Infra-red, mono/mic
Carrier frequency: 2.3MHz
Range: > 12m/100 square meter in room
Frequency response: 20-20, 000Hz
Thd at 1kHz: < 1%
Signal to noise: ~60dB
Max. Spl: ~120dB
Battery charging time: ~2 hours(fast charging)
Operating time: ~12-15 hours
Receiver(headset): ~40g