1----The use of microchips to collect heat: provide heat and transfer heat evenly to the skin through infrared pulse technology, so that the protein in the saliva of the mosquito can cause itching and deterioration and the pulse photoelectric can numb the skin of the mosquito bites to reduce itching. One-click itching relief, safer, more reliable and non-allergic. 2---Built-in linear motor: vibration massage to relieve itching, fast reaction speed, low power consumption, massage the bite area comfortably to reduce itching, effectively promote blood circulation and local blood flow in the bite area, accelerate blood circulation in the bite area and reduce itching. 3---Usage steps: 1. Turn on the button (light on) - 2. Aim at itchy skin, long press the button (the light continues to flash) - Heating (relieves itching) - 4. Release the button to stop heating the steps in sequence. Note: If it is not used for 3 seconds, it switches off automatically. 4---Small and portable: the device is small and lightweight, you can carry it at any time, suitable for family, travel camping, mountaineering, outdoor games, picnic. It is a must for outdoor activities. Suitable for adults and children. Material: ABS Product size: 7.3*3cm Battery: 200 mAh