TECKNET Wireless Doorbells for Home, IP65 Waterproof 1,300Ft 120dB Door Bell Ringer Wireless for Classroom with 60 Chimes & 5 Volume Levels, LED Flash

AIDA Mini Wireless Doorbell, Home Waterproof Doorbell 600ft Range, Cordless Door Bell Ringer, 4 Volume Levels with 32 Doorbell Chimes (White, Doorbell with 1 Button & 1 Receiver)

TECKNET Wireless Doorbell, Plug and Play, IP66 Waterproof Doorbell with RGB Light, 1300ft Door bell Kit, 60 Chimes & 5 Level Volume, 4.5 Years Using Time Cordless Doorbell for Classroom, Home

TECKNET Wireless Doorbell, Portable Doorbell with RGB Light, Battery Powered IP66 Waterproof Cordless Door Chime Kit, 1300 ft Wireless Range, 60 Chimes & 5 Level Volume, Using Time up to 4.5 Years

TECKNET Wireless Doorbell, Self-Powered Doorbell with 2 USB Ports, IP65 Waterproof Door Bells, Cordless Door Chime Kit with 60 Chimes, 5 Adjustable Volume and 1300Ft Range for Home Classroom Office