Ceiling or wall mountingGives loud 85dB alarm sound.Humidity:10%~85%Potential early fire detect and auto alarm;Temperature trigger: 55±5°C;Operation ambient: 0~60°C9V battery included Product size: 107x107x37.5mm   Box Size:125mm x 110mm x 55mmWeight:0.22kgCarton size: 57.5cmx27cmx30cm   50pcs/ctnGW/NW: 11kgs/12kgs