1. Equipped with a smart chip, which can record usage data 2. Increase the TPE soft glue to protect the skin 3. 360-degree rotatable angle, 3-speed strength adjustment 4. Fit the legs and increase the force bearing area 5. Material: PP, TPR 6. Battery capacity: 3.7V 150mAh 7. Charging interface: USB 8. Size: about 10 x 5cm 9. Weight: about 550 grams
