Description Receiver size: 76 * 80 * 33mm Transmitter size: 80 * 59 * 45mm Receiver working voltage: 110-240V Transmitter working voltage: 4.5V (3 No. 7 batteries) Receiver button: Music: 38 pieces of music available, with music logo buttons on the side for adjustment Volume: Three levels of volume adjustment (high, medium, and low) with side volume sign buttons for adjustment Can be set to sound and silent (sound: sound+indicator light Silent: indicator light) 2 working modes available for choice: only LED Light flashing or both sound and LED flashing. 3 levels of volume adjustment: High or Medium or Low. 38 ringtones for choose. Effective working receiver range is up to 70 meters. The PIR motion detection distance is 3-7 meters. It can be successfully used for your home, office, store, hotel or other buildings. Ideal for alerting business owners working behind the scenes or out of sight when customers enter the store. It can also be used as a signal when animal is ready to enter or exit. Applications: Entry Alert, Intruder Alarm, Corridor Alarm, Bug Detector, Car Alarm (Indoor), Warehouse Monitor, Power Closet Alarm, Garage and Tool Shed Monitor, Mailbox Sensor, Front Door or gateway detection. The package includes: a plug-in electronic receiver, a motion detector (power supply by 3 AAA batteries, NOT INCLUDED), and English instructions.