No control panel or float switches required; Performs like the non-automatic pump with no special float installation required; Requires very small space to operate - only 8 3/4" diameter; Urethane, Semi Vortex Impeller and Wear Plates for maximum durability with maintaining pump performance; Oil Lifter provides lubrication of the seal faces; V-Ring Seal Protector designs mechanical seal from abrasive particles; Environmentally friendly, reducing electrical costs and operational noise; Sensitive electrodes detect water to start pump operation even when foreign materials are present; Internal timer eliminates frequent on/off operation in rough water to extend motor life; Relay sensor completely molded in resin and covered by rubber case for protection against rough handling