Based on this product's specifications, here are some alternatives and similar models
Underwater Hot Tub Vacuum Bestway Lay-Z-Spa Rechargeable Cordless — battery 50 min, USB charging, 98×168×1550 mm
Summary description:
Rechargeable cordless underwater vacuum for hot tubs and inflatable spas by Bestway Lay-Z-Spa. Manual vacuum designed for pool & spa maintenance, powered by a rechargeable battery with up to 50 minutes runtime and USB charging (charging time 300 min). Compact grey/white unit with dimensions 98×168×1550 mm, suitable for removing debris and light dirt from spa floors and sides.