New in bulk packaging. The item may have slight surface scratches due to transportation and storage; please understand. Avoid pointing the radar antenna directly toward large metal equipment, rotating fans, or pipes. When installing multiple radar alarms, ensure the antennas of each radar module are parallel and avoid direct alignment between antennas. Maintain a minimum distance of 1 meter between modules. Radar sensing device suitable for outdoor use. The receiver can connect up to 10 radars and communicate within a range of 50–100 meters in open areas. Adjustable alarm modes including vibration and buzzer alerts. IPX7 waterproof rating, long battery life, and durable construction. Professional anti-theft equipment—installation must be performed by qualified personnel to ensure proper operation, maintenance, and repair. Parameters: Product size: 4 x 4 x 7 cm Working voltage: 3.7 V Radar frequency: 5.8 GHz Wireless distance: 50–100 m (open area) Package includes: As shown in option