How to Use: 1. Turn on the power switch to select the frequency, strength, temperature that suits your needs, and then place the metal surface of this product in the palm of your hand. 2. Massage frequency: 3 levels of fast, medium, slow are optional. 3. Massage strength: 10 levels of strength are optional. 4. Hand warming temperature: first level: 45°C; second level: 50°C; third level: 55°C optional. 5. Automatic shutdown function: In order to sleep better, the product will automatically pause for 15 minutes each time it is used (corresponding to the function indicator flashing), and enter the standby state. Press any key to continue working. If there is no operation, it will automatically shut down after 1 minute. Specification: Item Type: Sleep Instrument Material: ABS, Metal Product Size: Approx. 30 x 48 x 88mm / 1.2 x 1.9 x 3.5in Battery Capacity: 1500mAh Lithium Battery (Delivered with Battery) Massage Frequency: Fast, Medium, Slow 3 Levels Optional Massage Strength: 10 Levels of Strength Optional Hand Warming Temperature: First Level: 45°C, Second Level: 50°C, Third Level: 55°C Input Voltage: DC 5V/1A Input Interface: TYPE C Package List: 1 x Sleep Instrument1 x Charging Cable 1 x Manual Note: Manual measurement, please allow some errors.SAFE: Use 15 minutes to automatically pause, the corresponding function indicator flashes, if there is no operation, it will automatically shut down after 1 minute, which is safer and more power saving. MULTI FUNCTIONAL: A collection of sleep aids, hand massagers, and hand warmers can help you relieve anxiety, use the sleep aids for 20 minutes before going to bed every day to get a better sleep. ADJUSTABLE: Fast, medium and slow 3 levels of massage frequency, 10 levels of strength, one level of 45?, second level of 50?, and third level of 55? hand warming temperature optional. PORTABLE: Handheld sleep aid with lanyard design, very portable, light weight, easy to use at home, office, car, travel and anywhere, very friendly to people with insomnia. COMFORTABLE TO HOLD: The sleep instrument adopts a simple oval design, matte texture, in line with human holding design, simple and comfortable, it is an ideal gift for your relatives or friends.