Everyone need a high quality memory foam travel neck pillow. This pillow can provides extra support to protect the neck from pain when you are sitting in the seat on a plane, car, train or bus. It's also a good ideal for home. When you are watching TV, reading at home, and make you work easier in the office work nap. You can also purchase for your relatives, friends, colleagues and parents. It is a perfect gift.Colour Name:GrayIt doesn't push your head forward,but provide support for your neck and avoid awkward positioning and discomfort.Use Instructions:Unzip the zipper of the U-shaped pillow.Connect the USB cable with the external power supply, and pull up the power supply.Wear the U-shaped pillow, button up the buckle and adjust to the proper position.Notes:This product needs to be used with external power supply or power bank.Please keep ports, plugs and other parts dry.Women who has baby, infants and people who are not sensitive to temperature should not use this product.To avoid affecting the heating effect, please use the 5V 1A power supply.It is recommended to wear it for about 30 minutes every day, choose the comfortable temperatureYou can extend the time according to your physical condition and use habits.Due to manual measurement, there may be an error of 1 - 2cm in size.Parameter:Output voltage: 5VInput: DC 5V 1AUSB cable length: about 1mAdjustable belt size: 23cm (length) x 1.5cm (width)Pillowcase material: polyester fiber (90 percent), spandex (10 percent)Turn on/off: long press the switch for 3sThank you for purchasing my product. I hope to bring you good luck. If you have any questions, I will give you feedback as soon as possible.