Generic Rechargeable Dog Anti Bark Training Collar with 9 Seconds Recordable Voice and Electronic Shock for Correction, 8 Adjustable Sensitivity Control for Small Medium and Large Dogs 8 adjustable levels of sensitivity for different size dog; 7 repeated correction levels with voice or/and shock Automatic safety shut-off: to protect the dog, the device will automatically reset and stop working for 2 minutes when the continuous stimulus reaches the 7 levels A clip of voice message can be record and used as the warning voice. Easy to operate the device with 4 buttons