Item Type: Wireless Doorbell Material: ABS Uses:For Homes, Villas, Hotels, Factories, the Elderly, Patients, Pregnant Women, Etc. Specification: 1 Call Button,2 Receiver Doorbell Transmitter: Power Supply: Self Generating Doorbell Receiver: Power Consumption: 0.25W Ringtones: 38 Ringtones Transmission Distance: Open Space > 150m Radio Frequency: 433mhz Ring Volume: ≥50db/1m 1、Multi Purpose: Wireless doorbell is versatile, not only as a doorbell, but also as a pager, with strong practicability. 2、Wide Application: Waterproof mini doorbell can be used in homes, villas, hotels, factories, etc. It is also suitable for the elderly, patients, pregnant women, etc. 3、Long Distance Transmission: Nursing pager can transmit signals in a long distance. In an open place, the transmission distance is more than 150 meters, with strong penetration and one to one signal pairing. 4、IP68 Waterproof: Pager system adopts IP68 waterproof design, which is suitable for outdoor use and can prolong its service life. 5、Easy to Use: Waterproof wireless doorbell is a self generating doorbell, which is wiring free and battery free, and easy to install and use. 1 x Wireless Doorbell 2 x Receivers 1 x Sticker 1 x User Manual