SMATRUL 【No Battery Required】 Wireless Doorbell with 2 Press Self-Powered Transmitter & 1 Plug-in LED Flashing Receivers for Home,Office, 60 Chimes, 5 Level Volumes, Loud Volume (White, UK Plug)

SMATRUL 【No Battery Required】 Wireless Doorbell with 2 Press Self-Powered Transmitter & 1 Plug-in LED Flashing Receivers for Home,Office, 60 Chimes, 5 Level Volumes, Loud Volume (White, UK Plug)

Duracell High Power Lithium CR2 Battery 3 V, Pack of 2 (CR15H270) Designed for Use in Sensors, Keyless Locks, Photo Flash and Flashlights

ELECDON Wireless Doorbell,Waterproof Door Bell Kit, Distinguish front and rear doors, Over 1000 feet Range and 60 Chime, 5 Levels Volume and LED Flash, for Home Office Classroom