【RESPONSIVE & WIDE WIRELESS RANGE】 The motion sensor alarm catches movement from a surprisingly broad scope of space, with a Working Range of up to 500 feet (150 meters) between receiver and motion sensor, perfect for safety and small kids, great for use in the back yard by the pool. Moreover, you can use it for multiple purposes like for your store. It saves time and actually helps you a lot in your daily life..【HIGH PERFORMANCE & 2-in-1 DOORBELL】 Not only serves as a motion sensor detect alert but also a wireless doorbell to remind visitors of coming. 58 different chimes and 5 adjustable level volumes for a 30-110dB volume range allows you to set it anywhere you need. Great doorbell for the deaf and hard of hearing, different ringtones are set for different ringtone or receivers so you can know at which door you have a visitor..【INCREDIBLY EASY TO INSTALL & USE】 The sensor mounts and works on two AAA batteries (included) and the receiver plugs into a standard wall outlet. Our doorbell motion detector security sensor detects movement between 16.5ft/5m to 110 degrees, an activation for the receiver to alert. So easy to install and can rotate to any position you need..【EXPANDABLE WIRELESS HOME SECURITY】 Flexible design according to your actual needs. You can choose the quantity of transmitter and receiver you like, which can be freely matched with each other. Each receiver of this motion sensor detects an alarm and can work with 20 motion sensors at most..【LIFETIME TECHNICAL SUPPORT】 Return policy in 30 days / 24-hour reply / 2-year money back / replacement for any product defect and customer dissatisfaction via seller. If you have any questions, email us with your order number and questions.