100% New And High Quality Round button design, one key to turn on, adjust power. Fall asleep easily every day The use of this product can stimulate the neurotransmitter of the cerebral cortex through micro current to regulate emotions, thereby promoting sleep. Using this product, the hands can be properly stimulated, so that the same hand and brain frequencies can be used to relieve anxiety. Small and convenient, you can take it with you.Suitable for people with insomnia, overthinking, etc. Number of batteries required: 1PCS*AAA battery(not included) Package includes1 * Help sleep Note: 1. Due to the different monitor and lighting effect, the actual color of the item may be slightly different from the color shown on the pictures. 2. Please allow 1-3cm error due to manual measurement. (1 inch = 2.54 cm) Thanks for your support :)