2.4GHz/1.8GHz Wireless Digital Two-way Doorphone

1. Frequency :2.4GHz and 1.8GHz for option . 2. Wireless cryptographic door release technique,one million codes to avoid the mistakes. 3. Wireless two-way intercommunication between indoor unit and outdoor unit. 4. Digital signal transmission promises chear voice,anti-interference and private talking. 5. Working distance is around 150m. 6. Waterproof(IP44) outdoor unit . 7. Raincover for the outdoor unit is available. 8. Working status indication. 9. AC power supply