... order , you could buy around 10pcs for trail. When you use it , if you have any questions, please feel ... will be longer life. On usual , our client use it is 25--32 hours. IF you dont know ... how to use it , please contact me before use it. Softwares and CNC engraving machin, ... the preferred method of Payment.Western union,Paypal and T/T are ok.FeedbackSince your feedback is power to ...