Gas Leakage Detector sensor

Features:
Operating voltage: AC 220V;
Preheating time: about 120 seconds;
Alarm concentration: 10% ;
Alarm indication: red LED flashes and buzzer sounds
Operating temperature: -10?-50?;
Wireless frequency:433MHZ/315MHZ(optional);
Wireless distance: 100m(open space);
Size: 110*70*40m