【Always Know When Someone Arrives】This TECKNET wireless doorbell kit includes 2 push buttons and 4 receivers, providing a reliable 400 m / 1300 ft ultra-long range connection. Perfect for large houses, apartments, schools, or offices, the strong and stable signal ensures you can hear alerts anywhere 【Battery‑Powered Portable Receiver】A battery doorbell that requires no Wi‑Fi or wall sockets. Both receiver and transmitter run on batteries and can be placed anywhere or carried around like a pager. You may freely set the receiver on a table or keep it in your pocket. You will never miss visitors whether you stay in the basement, garage or backyard 【IP67 Waterproof & Durable】High-performance transmitter with ultra-low power consumption, uses a CR2032 lithium battery that boasts 4.5-year maximum lifespan; no need to worry about frequent battery replacement; IP65 weatherproof rating to withstand the harshest weather (-4 °F to 140 °F) 【60 Melodies, 5 Volume Levels & Memory Function】Personalize your doorbell with 60 unique ringtones and 5 adjustable volume levels (0–110dB). A noticeable LED light is included to alert individuals with hearing impairments or for situations where audible alerts are not required temporarily. The memory feature saves your settings, and our unique technology ensures they are retained even after a power outage 【36-Month Protection & Effortless Setup】Enjoy Truly Hassle-Free Installation. This Wireless Doorbell Comes Pre-Connected and Is Ready to Use Right Out of the Box. Set It Up in Minutes with the Optional Screw-Free Method. It Is Backed by Our Technical Support and a 36-Month Protection Plan to Guard Your Peace of Mind