Material: PlasticColor: WhiteFeatures:1.100 Meter Wireless Door Bell2.32 Melodies to choose from. Can be changed from a touch of a button3.Easy to install4.Waterproof remote button light up when pressed5.Remote button has double sided adhesive on the back of it6.Built in double speakers， makes the bell sound more clear7.Ideal for house， office etcInstructions:1.Press the small gap on the underside of the remote control with a flat screwdriver.2.Open the remote and insert the 12V battery (small battery， not included).3.Close the remote again and then stick it where you want with the adhesive back.4.Insert the 2 * AAA batteries (not included) into the receiver.5.Use the button on the side of the receiver to change the melody to your favouriteBatteries:23A 12V small battery for transmitter(not included)2*AAA batteries for receiver(not included)Transmitter size: 7.1cmx3.9cm/2.79"x1.54"Receiver:9.4cmx6cm/3.7"x2.36"Quantity:1PcPackage includes:1 x Remote Control Button.(Transmitter)1 x Wireless Musical Doorbell.(Receiver)