Specifications:
1) Distance: 10m (33 feet)
2) Audio frequency: 15bits, S/N: >60dB
3) Frequency: 2.4GHz - 2.4835GHz ISM band
4) Connection: point to point
5) Battery: rechargeable Li-ion 120mAh
6) Charger: 5V DC, 100 - 240V AC adapter
7) Output frequency: 0dBn (class II)
8) Time to charge: 2 ~ 3 hours
9) Usage temperature: -10 ~ 55 Degree Celsius
10) Storage temperature: -20 ~ 60 Degree Celsius