Based on this product's specifications, here are some alternatives and similar models
Knee compression massager HYPERICE Contrast 2 Knee — battery-powered, 90 min runtime, black, dimensions 108×255×402 mm
Summary description:
The HYPERICE Contrast 2 Knee is a battery-powered knee compression massager designed to deliver targeted pneumatic compression therapy. Features compression massage, 90 minutes runtime, and a compact design in black. Intended for use on the knee to reduce discomfort, support recovery and improve circulation after activity or injury. Portable dimensions make it suitable for home and travel.