ALEKO LM178 12/24V Universal Wired Metal Alloy Water Proof Two Door Control Keypad With Backlight Compatible with any other 12/24v gate opener or garage door opener Operating voltage 12-24v dc, 12-18v ac, support 1200 standard users Strong zinc alloy electroplated anti-vandal case, two-door independent control Can work as an extra card reader, and connect with any external doorbell Keyboard with backlight for easier operation at night, water proof for outdoor use