The ARIS Defender 1800 makes it easy to capture quality video-like images with simple one-handed operation in the most turbid waters. This diver-held sonar is ideal for detecting and inspecting underwater structures and targets from up to 35 meters. A mask-mounted color display updates up to 12 frames per second and makes real-time work simple and accurate. Battery life lasts up to four hours and powers fully autonomous operation; the optional Supervisory Kit allows simultaneous topside viewing and power input for continuous duty. Remove the floatation shell and handle to convert the ARIS Defender 1800 into a 300m depth rated ARIS Explorer 1800, suitable for deployment on ROVs, AUVs, boats, or fixed structures - combining two sonars in one versatile product!