Ajax Wireless Security Alarm Button "DoubleButton", White//https://ajax.systems/products/doublebutton/Compatibility: Operates with all Ajax hubs and range extenders (with OS Malevich 2.10)False alarm prevention: YesNumber of buttons: 2Alarm transmission: Not longer than 0,15 sec. Always active (does not require waking up to use)Power supply: CR2032 battery, 3 V; Up to 5 yearsOperating temperature range: From -10°C to +40°CPermissible humidity: Up to 75%Protection class: IP55