ATTENTION: If your breast size is larger than 36B,please choose the large size breast enlarger cup,otherwise please choose the small size breast enlarger cup. Please check your chest measurement and cup size before purchase,the cup only work once the breast cup fully fits with the chest,if choose wrong size,it won't have suction and won't have enlargement effect. Specification: Size:4.13 inch x 3.94 inch(105mm x 100mm) Material: Medical grade ABS Function: Breast shaping, Bustline increase Charging: No battery Sound vibrations: None For the crowd: Adults How to use: 1.Morning and evening. 2.Pull the lever until suction cup firmly suck breasts. 3.Pause to arrange valve deflated deflated can put half finished without a full release. 4.Tight back and forth again after absorbing do 10-15 minutes for a loop. 5.Each use two about three cycles. Note: 1. Due to different producing batches, there may be deviation of 2 ~ 3cm for items. 2. Colors on your computer monitor may differ slightly from actual product colors depending on your monitor settings! Thanks for your understanding!