Stimulates the brain into deep sleep Suitable for improving inspiration when thinking Consolidate your memory while you sleep Product size is compact and easy to carry Suitable for stabilizing the mind while meditating Can be via USB, never worry about its power shortage. With overcharge, overvoltage and overcurrent protection functions. Make you comfortable. Can effectively improve the quality of sleep, relieve insomnia and relieve fatigue. Composed of acrylic and electronic components, durable and not easy to damage. Easy to carry and easy to use. It is normal for each person to experience different results Colour:green Material:Acrylic Size: 6.8 x 5.2 x 1.8 cm Package Contents: 1 x host 1 x charging cable 1 x screwdriver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.