Hydra duct cleaning robot is mainly used for cleaning dust, non-oily dust and other dirt in horizontal or round large and medium-sized rectangular ducts. Free telescopic cleaning arm, 3-Way camera, No dead corners, Different brush heads for different ducts, 360º maneuverability & S pattern, Easy plugability with control box and vacuum cleaner, 30º obstacle climbing. https://bit.ly/2TxVWJ9