m220 stereo headset

Features:
1. Two-way 2.4 G short wave frequency hopping technique (global), radio traffic band automatically scans, address to code, and easy to realize match any matching, go where used, which really realize a wheat "teacher"
2. The clean health
3. Any matching, and not to completing colour in stock and registration, 1000 the same school (different) at the same time the classroom without using a crosstalk
4. Equipment management more convenient
5. Energy saving and environmental protection, green products, need not save frequent change of battery, polluting the environment
6. Small and portable, suitable for with you wherever you go
7. The USB interface lithium battery, filling a usable 8 hours。

Specifications:
Frequency response: 20HZ-20KHZ Speaker Impedance:32ohm
Driver Unit: 40mm HI-FI speaker
Rated Power: 20mW
Power Handing Capability: 40mW
Sensitivity: 119bB±3dB
Unit size: 150*115*35mm(130*75*35mm)
Carrier frequency: 2.4G Accept range: 10meters 360° FM way: GFSK Transmission power: 4dBM Frequency response: 20HZ-20KHZ Speaker Impedance: 32ohm
Driver Unit: 40mm HI-FI speaker
Sampling rate: 48K/DVD
SNR: ＞80dB
Distortion range: ＜0.1% Microphone impedance: ≤2.2kohm Frequency response: ≈8KHZ