VOYE Wireless Remote Door Bell Door Chime with 28 Ringtones [Built-in stereo speakers & adjustable volume] EASY: Simply plug receiver into the outlet,(US Plug 120v), battery for push button is included WIRELESS: Wireless range up to 400 ft (120 m) operating range 28 CHIMES: Different ringtones with adjustable volume; Built-in stereo speakers make the sound crisper and sweeter DESIGN: Lightweight, dustproof design, comprehensive protection WARRANTY: One-Year 100% Satisfaction Guaranty