Features: 1.Perfect for cold days out and cold days in the office or at home. 2. Use when out skiing or in cold weather and also just when you are at home. 3.Warm up instantly, keeping you comfortably warm for about half an hour. 4.Gel pad that crystallises once the metal disk is clicked releasing heat. 5. Reusable, boil in a pan of boiling water for 10-15 minutes. Specification: 100% brand new quality. Item Name:Hand Warmer Material: Gel + PVC Heating time: 0.5 hours Heating temperature: 20-55 degrees Celsius Color:As the picture shows Size:11cm/4.33in*10.5cm/4.13in How to use: 1. Force activate the heating plate. The iron plate is very stubborn and you press and hold the center. 2. The sheet metal material reacts chemically with the liquid and generates heat (solidification of the liquid) as the product starts to generate heat. 3. After coagulation, place the body bag in boiling water and warm it for 3 to 5 minutes. Once melted, it can be used again. Package includes: 1 x Hand Warmer（random style） Note: 1.Due to the different monitor and light effect, the actual color of the item might be slightly different from the color which is showed on the pictures. 2.Please forgive 1 cm/0.39"-3 cm/1.18" measuring deviation due to manual measurement.