Functions and Features: 1. Compact design, magnificent appearance; 2. B/W, Color camera, infra-red light source at night; 4. Call, Talking and unlock; 5. Call and talking between outdoor station and security center; 6. Code type keyboard，automatically back light at night; 7. LCD screen，all function be displayed by English; 8. Soft code 4-figure number for Interphone address, 999 Maximum. Delivery lead time 45 days Minimum order 200 sets