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 5‑8m / 16.4‑26.2ftm, medium sensitivity is 8‑12m / 26.2‑39.4ft, high sensitivity is 13‑16m / 42.7‑52.5ft. Specification: Item Type: Solar Driveway Alarm System Product Material: ABS Weight: Approx. 490g / 17.3oz Acceptance Distance: Approx. 200-300m / 656.2-984.3ft Low Sensitivity: Approx. 5-8m / 16.4-26.2ft Medium Sensitivity: Approx. 8-12m / 26.2-39.4ft High Sensitivity: Approx. 13-16m / 42.7-52.5ft Working Frequency Band: 433mhz FSK Detection Angle: 120 Degree Battery Type: 472540 Polymer 500mAh (Included) Solar Panel Specification: 5.5V 100mA Monocrystalline Silicon Music: 38 Pieces Volume: 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