GREENCYCLE 4 Pieces SF19R Wireless Entry Home Security Door Window Open Chime Doorbell, Burglar Alert Alarm, Tiny Magnetic Sensor Door Alarm for Home Garage Apartment Office Indoor Use Only

this is going to be a very quick review of the FA's none door entry alert it's a magnetic device and when the door opens it will play a timer a tone on the receiver that can be up to says a thousand feet away of course that will be lessened by any obstructions it comes with the receiver that you plug in the door sensor little user manual and 3m double-sided like tape carpet tape okay out of the box here's the receiver that you plug in on the side the top button is the volume button and there's the chime selector button at the bottom and it's supposed to have 52 unique tones and the volume button supposed to cycle through four volume levels and there's also supposed to be an LED it's supposed to light up when when the doors open as well and this is the door part and see how the tape is scored you would put a thin piece here and the fatter piece on the bigger part yeah it takes a double-a