Based on this product's specifications, here are some alternatives and similar models
Electrostimulation Massager ProLink EMS for Abdominal and Leg Muscles, Full Body
Summary description:
ProLink EMS electrostimulation massager is a wearable device designed to deliver electrical muscle stimulation to the abdomen, legs and other body areas. It uses EMS pulses to evoke muscle contractions for training, recovery and toning. Suitable for targeted muscle activation, rehabilitation support and supplemental home workouts; portable and battery powered for convenient use.