Keyless Access Control Keypad, Access Type Keypad, Interface 8 Bit Word; ABA Track II; ASCII; BCD; Wiegand, Case Material Stainless Steel, Finish Unfinished, Series K1, Height 5 1/8 in, Width 3 3/8 in, Depth 7/16 in, Number of Keys 12, Timed Entry Allowance 1 to 99 sec, Power Required 12 to 24V DC, 5 V DC, Operating Temp. Range -40 Degrees to 160 Degrees F, Max. User Codes 500, Weather Yes, Features Billion Cycle Switch Technology, Limited Lifetime Warranty