... . Superposition function characters, figures showed that the distance barrier; 10 around obstructions simulated show the direction ... a borehole embedded CMOS camera, infrared night vision device night vision camera, the distance 6 meters* Camera appearance options, such ... the rear four Sensor ,Probe color optional * Camera and Sensor, waterproof, shockproof, heat-resistant +80 ,low-temperature -30 ...