The Cyklop was originally only built in a small run- now due to popular demand we have more in stock! How does it work? The Cyklop alerts you of shadows and movements by the red LED light turning on and a non-annoying audio alert that will not hurt your ears. The range is approximately 8 feet = 2.5 meters. How to use? Make sure you are using a brand new, name brand battery. Turn the Cyklop on and it will beep once, calibrate, then beep again. Please allow 20-40 seconds for the calibration period to process so the Cyklop is "warmed up" and can perform optimally. Idea for alternative use: If you have a cat - it might either be an interesting toy for the cat - or it will deter your cat from being on a certain surface - like a countertop. Features: Visual alert - red LED light Audio alert Infared motion sensor Range: Approximately 6.5 feet = 2 meters Uses one name brand 9V alkaline battery (not included) Pocket/Purse sized - fits in your hand - and very light weight Dimensions 4.5”L x 2.5”W x 0.75”H (11cm L x 7cm W x 2cm H) Weight 3.4 oz (102 g) Built in USA Very Important! Be sure the 9V battery is inserted the correct way with + and – in the right position. If not, when you turn on the instrument, it will immediately ruin the electronic circuitry and make the instrument defective.