Product material: silicone + ABS + stainless steel, Product size: 152 * 230 * 70mm, input voltage/current 5V/1A; Plug interface: Type-C, battery capacity: 4000mAh; Use time: about 4-9 hours, depending on the gear; Use speed: 2350 rpm in first gear, 3000 rpm in second gear, 3500 rpm in third gear; Decibel size: first gear 28db second gear 35db third gear 42db. Skin-Friendly Soft Rubber Material -- The neck fan is made of environmentally and durable premium Silicone materials, which makes you warm to the touch and soft against your skin. Ergonomic design can be adjusted neck hanging at will for better-fit skin, and the back of your neck has a soft rubber texture that can effectively prevent sliding. Safety & 360 Airflow Design -- The bladeless design ensures safe use for the long-haired, children, and, the elderly. Adjust the angle of the fan so that the airflow is directed toward your face and neck, which allows you to feel the 360 air flowing and feel cool instantly. Lightweight & Portable Design -- The compact style neck fan hanging on the neck makes you look so cool, and the lightweight design helps you put less strain on the neck. If you are sitting at your desk working, on a lounger by a pool, on a chair in the garden, or even just going for a stroll, this little item will give your neck and head a good blast of refreshing air to keep you from melting.