The housing is made with impact-resistant, water-repellent plastic. It retains electrical and electronic equipment and also serves as a handle. - Measuring rod, the waterproof attached aluminium pipe houses precisely justified sensor coils. - 6 x 1.5V "AA" batteries for approximately 100 hrs. operating time. – Signal intensity displayed as a number between 1 and 99 and as an analog value on a bar chart. - The water resistant loudspeaker emits acoustic signals. A low standard tone changes with the signal intensity from detected objects. – It comes with a carrying case (with shoulder strap) to protect the device during transport. ** Use the "ERASE" switch to suppress disturbance fields (202SC Model only).