100 levels of static shock,The system is with 2 channels which can be used for 1 or 2 receivers.(item includes 2 receivers)

Features:

100 levels of vibration. - 100 levels of static shock. - The levels can be altered by pressing up & down button. - The system is with 2 channels which can be used for 1 or 2 receivers.(item includes 2 receivers) - Transmission Frequency: 433~825MHz - The controller & receiver built-in 3.7V/550mAh rechargeable lithium battery

pets training for 1 dog,Lithium battery