Check the listing for details. NEW NIB BUNKER HILL SECURITY Driveway Alert System, Wireless easy installation. Condition: New. Listed at 29.99 USD. BUNKER HILL SECURITY ,NEW INBOX Driveway Alert System, WirelessThis wireless alert system uses a wireless receiver in your home that chimes when the infrared driveway alert sensor outside detects motion, so you’ll be prepared for that unexpected knock at the door or beep in your driveway. This wireless alert systems wireless motion sensor mounts outside on a post or wall and you can set the receiver anywhere in your house within 400 ft. of the sensor. Completely wireless easy installation Weather-resistant plastic400 ft. rangeInfrared sensorBatteries required: 3 C and one 9 volt (sold separately).Sensor range: 30 ft. within a 40° fieldRadio range: 200 ft.Radio frequency: 433 MHz SHIPPING: IN USA 48 STATES $4.99