Gosund Door Chime, 433MHz Wireless Door Open Chime Video Doorbell 
Easy Installation - No batteries needed for the plug-in receiver. Simply plug it into a power supply (US Standard).
Led Flash Alert - Blue flash light makes it a more obvious reminder when you are in a noisy surrounding, ensure timely response even when you are wearing your headphones or even earplugs! Also it is convenient for the one who has a hearing problem.

Up to 300 Feet (100m) Long Range: Either you are occupied in the bedroom or at the kitchen, it can remind you that someone is calling from outside. Free your worry about missing visitors.

Dependable Operating Range- Each doorbell chime is set with a unique radio frequency code at the factory. This gaurantees your doorbell will not interfere with other remotes devices, and its 300ft (100m) operating range means you can place the plug-in unit several rooms away from the door. It can only work with Gosund video doorbell.

Warranty: Every Gosund product enjoys a 90-day worry-free guarantee & 60 days money back Guarantee.