■ Specifications: Receiver size: Approximately 102 x 52 x 35mm Transmitter size: Approximately 78 x 44 x 23.5mm, 130g ■ Power supply: Receiver: Uses 2 AAA batteries (sold separately) Transmitter: 23A 12V battery x 1 (included) ■ Set contents: 1 receiver, 1 transmitter ● Suitable not only as a home doorbell, but also as a call bell for the elderly, pregnant women who have difficulty moving around, and people with disabilities. It can also be used as a call bell in stores and offices when unattended. ● The maximum volume is 110dB, which alerts those with hearing impairments with a loud sound and light. ● As a replacement for a doorbell, it is perfect for those who cannot easily hear the doorbell in a distant room, when you want to call your children on the second floor, or when you want to call family members in a distant room. ● The radio wave range is up to 100m outdoors, so you can notice the chime immediately wherever you are in the house. ● It is convenient to carry around by threading a string through it. Since it is wireless, there is no troublesome wiring. Simply insert the batteries into the main unit and stick the button part, and it can be easily installed anywhere. ● Even when mounted on a wall, it is waterproof, so it can be used in bathrooms and wet areas.