Functions and Features： 1. Attractive design, magnificent appearance; 2. Code type keyboard, automatically back light at night; 3. LCD screen，all function be displayed by English; 4. Call, Talking and unlock; 5. Monitoring at any time; 6. Timely switching-off while monitoring or talking; 7 Reminding for hanging-off; 8. Monitoring time: Automatically switching-off in 30 seconds; 9. Talking time: Automatically switching-off in 45 seconds. 10.Unlock with 6-figure password set by dweller 11.One code number for one dwellerUp to 256 dwellers available 12.Security management center calling, restricting unwelcome visitor 13.Networking with community security center through one net switcher Delivery lead time 45 days Minimum order 200 sets