Product Description-SR-903 Main features: 1.SR-903 is network combustible gas detector 2.High-reliability sensor 3.Auto Reset 4.MCU processing 5.Malfunction auto-check indicator 6.Detect natural gas or LPG 7.Sound &LED flash alarm output 8.Execute criterion: GB15322, UL1484, EN50194 Technical specification: Operating voltage: DC9-24V Gas species: Natural gas &LPG Standby current: less than 90mA/less than 30mA (low power consumption) Alarm current: less than 100mA/ less than 40mA (low power consumption) Alarm output: Relay output &Sound &LED flash alarm Alarm level: 10%±5% LEL Sound level: â?¥85dB/m Installation: Ceiling mounted Working environment: -10~+50(â?¤95%RH No congelation) Dimension: 100*35mm (SR-903)