Make a really good deal!when use, be sure to open bottom switch,otherwise the machine will not work,loos dead >Operation For safety reason,this machine is designed with 3 lock switches.Only open on/off switch,press trigger and push tacker header can start working. Battery indicator:green for enough battery,red for shortage of battery Charging status:in charging:red;fully charged:green Working advice This machine is not suitable for working with 25+ mm staples.therefore,do not use the machine to fasten ceiling paneling with profiled wood or grooves.When the staples is jammed in the machine,do not hold the machine by the trigger .when removing a jammed staples ,the trigger can be inadvertently actuated.