... Wireless signal alarm Dustproof,mothproof Name:CE Approved Wireless smoke electronic optical sensor(DC9V 315M/433M)Model:LS-828-3PFFeature1 ... PCB4.High denstity SMT design,high stability5.Dustproof,mothproof and anti-white light6.Emission frequency:315M/433MModelLS-828- ... lamp,burglarsystem,security accessory series,CCTV system CE Approved Wireless smoke electronic optical sensor(DC9V 315M/433M)