WanTech R300 2.7" 140&deg; Dual Lens Dash Board Camera Black Box Video Recorder Car HD DVR Built-in double lens can be used to take two images at front and back at the same time. GPS module can record the whole driving track. Using random specialized software, you can see the video at computer, at the same time connect Google map through the Internet. Driving track shows on the map and you can trace the running route of the vehicle. Built-in gravity sensor G-Sensor can record the gravity sensing information. Using random specialized software, you can see the video at computer, at the same time read the gravity sensing data to trace accident and abnormal circumstance occurred in the running process. Built-in 1/4 inch low-noise and high-quality photographic element can capture ultra clear picture in a dark place