Regulate Emotions: You can use this product to regulate mood by stimulating neurotransmitters in the cerebral with micro-currents. Small and Convenient: This sleep aid is small and convenient which can be carried around. Safe and Healthy: This product is safe and healthy by physically regulating your sleep rather than medication. Easy to Wear: This product has a strap design, which is elastic and stretchable. Size:. 8.8x4.2x3.0cm/3.5x1.7x1.2inch Color:B:White Material:ABS Package Contents: 1 * Sleep Device 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.