Dual-purpose cooling and heating.Long battery life.Six-speed adjustment.Noise reduction and mute.The new second-generation upgraded cooling and heating principle,the intelligent chip controls the temperature,and the aviation aluminum-grade thermal conductive sheet,which has a stronger heating and cooling performance,allowing the whole body to feel warm and cold. Cooling through the peltier,It can reach deep skin in 2 seconds.Cool down in a short time, cool for a summer.Adopt second-generation heating technologyMore powerful heating technology, fast heatingin 3 seconds, the temperature follows the aorticblood flow throughout the body,as if being wrapped in warm air. Based on design principle,Avoid the whirring noise caused by the internal motor,fan blades and air duct of the traditional hanging neck heating and cooling device that can be used in meetingsNot disturbing is the best company. The product is equipped with two highly sensitive detectors, which can intelligently controlthe temperature at the user-adjusted degree andmaintain a constant temperature. The silicone part of the hanging neck is made of elastic plastic + silicone.The soft and adjustable angle makes the product suitable for more different people.At the same time have an excellent wearing feeling. Using selected high-quality soft glue,soft and skin-friendly, avoid most skin allergies;The skin-friendly material is soft and tough,resistant to oil and dirt,and is still as new for long-term wear.One-piece bib design,suitable for all-round and multi-angle wearing Hanging around your neck,it's as light as a headset, and it's easy to go with you. Dual-purpose cooling and heating , Intelligent constant temperature, Comfortable to wear,Cool lighting . Colour:black Material:ABS Size:17 x 14.7 x 4cm Package Contents: 1 * air conditionerneck fan Only the above package content, other products are not included. Note: Light 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.