■ 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 doorbell for your home, 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's perfect for those who can't 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 separate room. ● The radio wave range is up to 100m outdoors, so you can notice the chime immediately wherever you are in the house. ● It's convenient to carry around by attaching a string. Since it's wireless, there's no need for 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.