AGPtek Rechargeable Wireless LCD digital dog Training Shock collar with 100LV of Shock and Vibration, Remote Control 100 levels of vibration, 100 levels of static The levels can be altered by use of up & down button Lovely color special for girls The Collar length can be adjustable from 12 inches to 22 inches If you hear noise from the collar when you shock it, it is normal as it comes from the charging beads inside