Zacro Rechargeable Dog Training Collar with Wireless Remote for 2 Dogs - 8 Levels of Shock and Vibration Correction Plus Sound Mode - Fully Adjustable Electric E Collar for Large and Medium Dogs 3 Training Modes: Static Shock Stimulation, Vibration, and Sound :8 adjustable Levels of Vibration and Shock Stimulation Long Distance Control: Operational Range is up to 800 Yards Durable and Adjustable Dog Shock Collar Strap: Fits all dogs; From 25 to 150 lbs with an adjustable Nylon collar size from 10 to 22 inches long Easy to Use: Convenience of operation, easy-to-read LCD screen shows the stimulation; Backlight LCD screen for easy low light condition viewing Rechargeable and Power Saving: Built-in high capacity lithium rechargeable batteries (500mAh for transmitter and 240mAh for receiver) Power Saving Design with Movement Sensor