Item Type: Alarm Systems & SecurityItem Height: 1 cmItem Width: 1 cmSpecial Features: Pressure Monitor ValveExternal Testing Certification: CEItem Length: 2.3 cmMaterial Type: Stainless steelItem Weight: 30 gUnit Type: lot (4 pieces/lot)Package Weight: 0.200kg (0.44lb.)Package Size: 10cm x 10cm x 10cm (3.94in x 3.94in x 3.94in)Green display = Pressure NormalYellow display = Pressure WarningRed display = Pressure Dangerous