Wireless Doorbell Kit with 3 Plug-in Receivers & 2 Buttons Waterproof Operating at over 1000-feet Range with 36 Chimes, 4 Volume Levels Loud Enough for Elderly (G) Fair Price with Genuine Capacity Interface:USB 2.0 Works on all Major Operating Systems: Windows, iOS,Linux etc. Low Power Consumption, durable solid-state storage