1. Half-duplex mode and full-duplex mode selectable

2. Max 4 players communication in one group in full-duplex mode

3. Unlimited number of players in half-duplex mode

4. 16 communication channels on ISM band(unlicensed frequency bands)

5. Group extension up to max 4 groups

6. Different models based on different operation frequencies, 2.4GHz, 900MHz, 433MHz

7. Three different models with communication distance up to 200m, 500m, 1km, respectively

8. Digitized 8KHz, 16-bit voice quality

9. 5 levels volume

10. Voice activation(VOX) function

11. Digital security encryption

12. Power source: Li-ion battery, Ni-Mh rechargeable battery, or AAA battery *3

13. Battery life: Continuous operation> 8 Hrs.

14. Automatically power saving to save battery power

15. Low Voltage Indication

16. OLED display with backlight(optional)