Feature:1. Easy Installation: This solar driveway alarm system does not have complex wires or installation trouble, and the sensor can be hung on the wall. You just need to place the wireless motion sensor and alarm receiver anywhere you like.2. Fore Warning: Solar driveway alarm infrared sensor door bell is perfect for long or hidden driveways and allows you a fore warning when guests (or intruders) are approaching.3. Wide Applications: Car alarm(interior), warehouse monitor, supply closet alarm, garage and tool shed monitor, mailbox sensor, front door or walkway detection.4. Applicable Scenes: Solar wireless driveway alarm system can be successfully used in your home, office, store, hotel, or other buildings.5. Sensitivity Distance: Low sensitivity is 58m / 16.426.2ftm, medium sensitivity is 812m / 26.239.4ft, high sensitivity is 1316m / 42.752.5ft.Specification:Item Type: Solar Driveway Alarm SystemProduct Material: ABSWeight: Approx. 490g / 17.3ozAcceptance Distance: Approx. 200-300m / 656.2-984.3ftLow Sensitivity: Approx. 5-8m / 16.4-26.2ftMedium Sensitivity: Approx. 8-12m / 26.2-39.4ftHigh Sensitivity: Approx. 13-16m / 42.7-52.5ftWorking Frequency Band: 433mhz FSKDetection Angle: 120 DegreeBattery Type: 472540 Polymer 500mAh (Included)Solar Panel Specification: 5.5V 100mA Monocrystalline SiliconMusic: 38 PiecesVolume: Four Level Volume Adjustment (High, Medium, And Low Mute).Package List:2 x Detectors1 x Receiver2 x Bracket1 x Manual10 x Screw10 x Expansion Tube1 x Pin