How to adjust the Vibration and Shock Level? 1: Press the 1/2 button once to change Channel 1 or Channel 2. 2: Press and hold 1/2 button until the Vibration digit number blinks, then press ? + - ? to adjust Vibration Level from 1-8. 3: Or until the shock digit number blinks, press ? + - ? to adjust Shock Level from 1-16. You also can refer to the Page 11 of Instruction. And contact Bousnic Customer Service a tutorial video When you're looking to improve your dog?s behavior at home or in social settings, the Bousnic Dog Training Collar is the perfect solution to all your dog training needs. Safe, humane, and effective, these collars are great for dogs of all shapes, sizes, and breeds. And thanks to the adjustable static shock, vibration and beep stimulation modes, you?ll find a safe stimulation that works for your dog?s behavior and needs. Dog Shock Collar Details: - Rechargeable Collar and Remote: - Remote Battery: 240mAH (Lithium Ion) - Receiver Battery: 300mAH (Lithium Ion) - Vibration: 1- 8 Levels - Shock: 1-16 Levels - Beep: Standard - Range: Up to 330 Yards - Charge Time: 2-3 Hours - Lasts 15-20 Days per Charge - LCD Display, Light Mode Order Includes: Remote Transmitter Collar Receiver with Strap Power Adapter USB Charging Cable Test Bulb Wrist Strap Contact Points (4-Pcs) Conductive Silicone (4-Pcs) Instruction Manual