HeBei LEE扴 Idustrial Co.,Ltd ShangHai Branch(Abbr.HBLSSHB) ,is a trader and manufacturer in China mainland. Our products: wireless Doorbell; non-contact voltage detector;Business types: Exporter,OEM/ODM , Manufacturer , We assure a best service of china for you through our specialized style and over ten year's business experience Wireless doorbell HBLSSHB WD5 Transmits up to 300 feet (open air), Crispy Sound, CE certified. Frequency :433.92MHz or 315MHz; Pushbutton takes (1) A23 12 Volt Battery Remote Receiver operates on 110 V or 230 V . 128 selectable channels prevent outside interference & allow system expansion 4 tones selectable Weather-proof for outdoor use Wireless - Simple Installation