Features:Hand-held sleep instrument: apply low-frequency electrical pulses stimulate to the palm, conduct from the nervous system of the hands to the brain stem to realize the same frequency of the hands and brain, have a positive effect on neurotransmitters such as endorphins and melatonin, and make the human body more calm and relaxed.Calm the mood: Reduce stress in daily life and work to relax!Invigorate the : the invigorate mode, get rid of troubles, improve concentration, double the efficiency of learning and work!Portable Design: Compact and lightweight, easy to carry.Multi mode design: In different mode, it can better promote the rapid increase of neurotransmitters.Notice:1.Actual color may be slightly different from the image due to different light effect2.Please allow 1-3cm deviation due to manual measurementDescription:Material:ABS Plastic + Stainless Steel ProcessSize:6.5x4x3.5cmBuilt-in battery capacity: 300mAhCharging voltage: DC5.0V/1AOperating voltage: 3.7vWorking current: 0.005ARated power: 0.3WRated current: 200MABattery life: 2 hoursCharging time: 1 hourWorking gear: 15Product weight: 27g (net), 100g (gross)Product size: 6.5x4x3.5cmPackage size: 10.4x9.3x4.1cmPacking list: Sleep meter x1, USB charging cable x1, manual x1