Description: No Battery Required - The wireless doorbell never need battery for use. Self-powered push button converts for kinetic force into electric energy, no batteries required. Long Range - Operating range up to 1,000ft/300m in open area ensures you to hear the bell and answer the door in time. Waterproof Design - IP55 dustproof and waterproof rating; works between -4 °F to 140 °F; withstands various harsh weather conditions. Multiple Volume Option - There are 52 different ring tones with 4 levels of adjustable volume from 0 dB to 110 dB. Flashing light with audio a-lert indicators which is easy for people including the hearing impaired to notice. The self powered doorbell has CE, FCC,RoHS certifications. Built-in LED Indicator - Our wireless doorbell receivers and transmitters feature LED indicators that creates visual alerts for the hearing impaired. Wireless Plug-in Receiver - The portable wireless plug-in receiver plugs into any standard outlet. MEMORY FUNCTION - Preserves your last-set melody and volume level after a power outage; no need to reset to your previous settings; convenient and easy-to-use design for an enhanced user experience. Easy Installation : Just plug the receiver into a socket and affix the transmitter on a wall using the provided accessories; You can install push button easily with double-sided adhesive patch or screws we provided in package in anywhere. Specifications: Color: As Shown. Material: ABS. Waterproof:IP44 Size: Features : - Self-powered push button converts for kinetic force into electric energy, no batteries required. - 52 unique ringtones and 4 Levels volumn adjustment including mute - Features built-in LED indicators that create visual alerts for hearing impaired - 1000ft/300m operating range - Wire free and easy to install with the included accessories Note: There might be a bit color distortions due to different computer resolutions. There might be a slight errors due to different hand measurement. Package included: 2 Receiver+ 1 Transmitter