1. 5 levels of far-infrared hot compress therapy: 40, 45, 50, 55, 60, effectively relieve ankle pain2. 3 levels of massage vibration intensity, 1 level for daily care, 2 levels for sports care, 3 levels to relieve ankle discomfort, can meet different massage intensity requirements3. 30-minute intelligent timing, to use, avoid excessive use4. Adopt temperature control system, temperature control chip, temperature control and anti-scalding, safe to use5. Breathable fabric, , warm and not bloated, outer layer windproof, middle layer infrared heating, inner layer anti-slip convex Buckle firmly binds the ankle to protect the left and right feetProduct parametersProduct name: Electric heating ankle guardRated voltage: 3.7VRated power: 7WInput voltage: 5VInput current: 1AInput power: 5WBattery: 1800mAhCharging time: about 3 hoursUsage time: about 3 times, 30 minutes per usePower supply: USB charging Type-cCharging status: The charging indicator light is green and displays LL, and displays when fully .Note: If the product is connected to the power supply for charging during the startup process, the product automatically stop working. Do not start the product during charging.Color: GreyMaterial: ABSPackage Contents:1 * Ankle protector (including non-detachable rechargeable host)1 * Charging cable1 * English instruction manualOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.