Thread Burning Tool Handheld Battery Powered Instant Heat Thread Ends Burning Pen Item Type: Thread Burning Tool Material: Plastic Application: Pyrography, thread end burning, wax engraving caving, etc. Usage: Turn the tail to open and place 1pc AA battery (not included) (according to the direction of the pen body aiming at the battery), press the button to heat for 3 to 5 seconds e. Note: 1. The tip of a tungsten filament heating and burning the thread. The voltage is not high (1.5V), but it will cause scald if it touches objects or skin when there is no cooling at all 2. The tungsten wire of the pen nib will become soft and easily deformed after heating, and it is easy to break off. Therefore, it is used to cover the pen cap when it is not in use to prevent it from being broken off 3. This product is applicable to polyester wax thread, the hemp thread and cotton thread are not applicable