The Extech HDV600 / HDV610 / HDV620 High Definition VideoScope Inspection Cameras deliver high image resolution on large color display where images and videos can be stored on SD memory card (included). The Model HDV610 has a 5.5mm diameter camera head with 1m flexible cable and the Model HDV620 has 5.8mm diameter camera head with 1m semi-rigid cable. Both models are equiped with a 5.7" color LCD TFT with high definition 640 x 480 resolution, mini, high-resolution water-proof (IP57) camera head, Rugged water and drop proof housing (IP67/2m). An optional wireless transmitter (HDV-WTX) connects to your camera cable and allows you to transmit video up to 100ft (30m) from the measurement point to your monitor.