Ergonomic design of this sleeping instrument makes it comfortable to hold when you sleep at night. The sleeping instrument will be helpful for people with poor sleeping quality and helps them to fall asleep as soon as possible. It is made of ABS, PC and steel material, the sleeping instrument is durable and reliable to use. It is non-medicine so will do no harm to the body. In cold weather, you can use it for warming hands and massage at the same time, in that case, the sleeping aid effect is more obvious. You dont need to hold it all the time when you use it for massage, so you can place it at will. With a large area of heating sheet, the warming effect is faster and more uniform, and the massage position is more precise. The length of the product is 8.7cm, the width is 4.8cm, the height is 2.95cm. After a busy day of work, you can release the pressure and relax yourself with the help of this product, which can help you to fall asleep at night. This product adopts microcurrent principle, which stimulates the cerebral cortex nerves to regulate emotions and promote sleeping. It has built-in high-performance control chip for safe output. The 1600mAh battery can ensure the supply of massage and hand warming. Item Name: Sleeping Instrument Material: Steel,ABS,PC Model: YC01 Color: White Input Voltage: DC5V/1A Battery: Built-in 3.7V 1600mAh Rechargeable Battery(Included) Hand Warming Temperature: 45 Degrees (First Gear); 50 Degrees (Second Gear); 55 Degrees (Third Gear) Input Interface: Type-C Features: Microcurrent, Ergonomic Design, Pressure Relief Size Details: 8.7cm x 4.8cm x 2.95cm/3.43" x 1.89" x 1.16" (Approx.) Notes: Due to the light and the screen setting difference, the item's color may slightly differ from the pictures. Please allow slight dimension difference due to the manual measurement. Package Includes: 1 x Sleeping Instrument 1 x Charging Cable 1 x Lanyard 1 x User Manual