This is the device that automatically marks the location of your car on a free iPhone app, eliminating the need to remember where you parked. The beacon simply plugs into a car’s power outlet and when the car’s engine is turned off the device automatically marks the car's location on a map app via Bluetooth. When it's time to return to the car, the app displays your automobile’s location on the map so you can find it easily. Each location is date and time-stamped, providing a convenient reminder for when a parking meter needs to be replenished. A USB port built-into the beacon allows you to charge a smartphone or tablet. 3 1/4" L x 1 1/2" W x 1" D. (3/4 oz.)