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1.easy to install (no wiring required)2.consist of door push button(transmitter) and portable door chime(receiver)3.ideal for home,office,factory,reception areas,etc. you 'll rtever miss you visitorButton:1.powered by 12volts alkaline battery2.battery typically last one year or more3.can be mounted with screw or double-side tape4.red light indicates batteries are good5.signal passes through doors. wall and floors6.Ranger:0-50FOOTDoorbell chime1.Realistic dual tone doorbell sound2.Can be mounted with screw or double tape or placed anywhere3.Use No.5AA alkaline batteries.4.Use magnetic speaker for superior sound quality,
