AGPtEK&reg; 1000 Yards Wireless Rechargeable Dog Training Collar and Wireless LCD Remote Control Set with 8 Levels of Vibration and Shock for Medium or Large Dog (20lb to 150lb) Real Rechargeable Design Powerful Function Design: Four Functions -- 8 LV vibration, 8LV shock, 3LV collar tracking tone, 3LV remote tone. Three Modes - A Mode, B Mode, AB Mode. Advanced RF 434Mhz Technology usage range up to 1000 yards. Remote with Easy to operate and read the modes and levels on the White Backlight LCD Screen Remote at dark environments. One second press on the menu button wakes it up from sleep mode Suitable for dogs from 20 to150lb.