Motion door chime

From the shop's description

Features Motion sensor door entry bell/welcome alarm Two modes (“Ding Dong Bell” & “Ding Dong Bell with welcome greeting”) which can choose/select with switch on the side Light controlled infrared sensor will detect the guest entrance and sound Powered by 3 x AA batteries and no wiring needed Self install able with included wall mount Item Description Approximate Dimensions : H 4″ x W 2.5″ x D 1.5″ (10cm x 6cm x 3cm) Power = 3 x AA Batteries (Not Included)