... free warranty. 4.Best seller. Features:1. Touch keypad LCD displays date, day of the week, time ... system have 5 ways: SMS, main host (keypad), wireless keypad, keychain remotes, or even remotely by phones ( ... low-voltage indicators. 10. The host has the keypad and function keys, easy to operate.11. ... Built-in-li-lon backup battery, it will switch automatically when the low power or without external power ...