SuperTek Upgrade Blue LCD Display Rechargeable Wireless Digital Dog Training Shock Collar with 100lv of Shock and Vibration, Remote Control Works At Night Upgrade Dog training collars blue LED Display,works at night Both of the receiver and remote can be recharged,waterproof 300yards collar remote control electric shock devices,collar can be adjustable from 12"-22" dog 100 levels of vibration&static LCD digital remote control electric training Collar Work for Small \ Medium \Large (From 10 pounds to 130 pounds) dogs