wireless smoke detector hidden camera

item name smoke alarm(SS-168) certificate CE process Single-sided PCB Process packing carton inner/big carton outer sensor Optical cavity maze color white Smoke sensitivity 3.2% weak smoke/foot have response item size dia 10.5cm,height 3.6cm detector methos Photoelectric detect inner packing 10.5*10.5*3.6cm power supply battery outer packing 55*39*23cm working voltage 12VDC N.W/PC 0.1kg working currency Static