Dragy uses high speed GPS satellites to accurately measure your vehicles performance within 1/10th of a second, producing identical results to the much more expensive and cumbersome VBOX system, in a less expensive and easier to use package. The Dragy software automatically charts slope on all timeslips which you can then post to forums or social media, share with friends, or even upload to the Dragy leader board. The Dragy box is extremely compact at 1" x 3" and can be set on the dash when testing and throw in the glove box or center console when not in use. Note: video overlay is only available on iPhone(Android coming soon)Features:Dragy10 Hz GPS GLONASSModel: DRG69GPS: 10Hz Assisted GPS, GlonassBluetooth: 4.0System: iOS, AndroidInput: 5V -----___ 400 mABattery: 3.7V 500mAhPower: 200mWBattery life: 8-10 hoursCharging time: 1.5 hoursCharging port: Micro USBOperating tempreture: 14 to 140 F (-10 to 60 C)Charging tempreture: 14 to 113 F (-10 to 45 C)Product Details:Item Weight: 4.5 ouncesProduct Dimensions: 3 x 1 x 0.5 inchesItem model number: DRG69Batteries: 1 Lithium Polymer batteries required. (included)Shipping Weight: 5.6 ounces