The wireless door bell has high performance because of its high sensitivity and long operating range.The wireless doorbell rings as soon as you press the transmitter lightly since it generates electricity with motor instead of batteries, which is energy-saving.Made of plastic, the wireless door bell is eco-friendly and durable to use. It is waterproof, which has long service time.The length of the product is 9.1cm, width is 5.9cm and height is 2.5cm.The wireless door bell is suitable for being used in home, office, shop, mall and so on. It can also serve as pager of elder, which is multi-purpose.Item Name: Wireless DoorbellMaterial: PlasticPlug Type: US Plug, EU Plug, UK Plug(Optional)Music Selection: 36 SongsReceiver Voltage: AC110-240VWorking Range: 300mFeatures: Sensitive, Waterproof, LightweightSize Details: 9.1cm x 5.9cm x 2.5cm/3.58" x 2.32" x 0.98" (Approx.)Notes:Due to the light and the screen setting difference, the item's color may slightly differs from the pictures.Please allow slight dimension difference due to the manual measurement.Package Includes:1 x Transmitter1 x Receiver1 x Double-sided Tape2 x Screws1 x Sticker