Aiper Surfer S2 Robotic Pool SkimmerAiper Surfer S2 Cordless Robotic Pool Skimmer For Any Pool, Any Shape, Any Conditions SolarSeeker Technology When the battery runs low, the Surfer S2 automatically moves to sunlight for a quick 15 minute solar charge before resuming cleaning, ensuring seamless operation with minimal effort. Industry First DebrisGuard Design Leave No Debris Left Behind When docking or reversing, the Surfer S2s Aquadynamic Baffle activates, preventing debris overflow