Operating voltage: dc9v Alarm current: =10ma(dc9v) Battery life: 1year Alarm indication: red led on Spl: =85db/m Operating temperature: -10? to +50? Operating humidity: =95% rh Alarm type: flash&sound alarm Detecting area: 40 squre meters when installation height between 6-12m; 20squre meters when intallation height within 6m