Product Description of KERUI M521 Wireless Doorbell

• Easy to install.
• Rugged waterproof design.
• Keep your children safe.
• 24/7 lifeguard for your family.
• Monitor every areas you care with wireless door chime.
• Up to 390ft/120m transmission range (in open area).
• Different song use for different modes.
• 57 different music tones are optional.
• Memory function, never lose last set whatever power off.
• The host can set the fixed doorbell music button.