The waterproof imager head design extends to underwater 3.3 feet, allowing to inspect underwater areas, crevices and holes. Compatible with MX808S/ MK808S/ MK808BT PRO/ MK808S-TS/ MP808S/ MP808S-TS/ MP808BT PRO/ DS808S-BT/ MS906 Pro/ MS906 Pro-TS/ MK908 PRO II/ Elite II/ MS909/ MS919/ Ultra/ Ultra Lite/ Ultra EV, etc.