1. 2.4GHz digital frequency hopping and encryption technology, transmission distance up to 300 meters in open area, robust anti-interference; 2. Clear night vision: can capture image in low-illumination environment. This model is still very clear in 5m, while the genral vidoe door phone not clear exceed 1m. 3. Rain shield for the outdoor camera is available; 4. 7 inch Digital TFT color panel; 5. High-strength tempering glass, abrasion resistant and scratch, longer working life; 6. High Sensitivity touch keys 7. Monitor, wireless unlock, hands-free call and talk; 8. 16 chord melodies and melody volume is adjustable; 9. Date and time are showed on screen; 10. Indoor monitor store up to 100pcs pictures, pictures mark date and time; 11. Brightness and talk volume are adjustable 12. BL-5J battery of camera and monitor is replaceable and rechargeable; 13. Outdoor camera has two work modes: 1) Plugging in the power adaptor. ¡¡¡¡ 2) Using battery, it can works about 15 days. 14. With Wireless unlock control ,Tamper alarm function; 15. One outdoor camera supports up to 3pcs indoor monitors and vice versa; 16. The outdoor unit with the function of tamper alarm, and if you keep pressing outdoor calling key more than 5 seconds, will turn off battery battery¡¯s power, once again turn on power.