Description Switches are commonly replaced parts in power tools. A switch handles all on/off and variable speed functions. They also have a role in electric breaking; they can momentarily reverse electrical polarity, because switches use mechanical internals, they tend to degrade and wear out over time eventually requiring replacement. Some common signs of a broken or failing switch are: 1. Tool has completely stopped functioning - it not turn on 2. Tool operates intermittently, requiring multiple tries on to turn on, until eventually it t turn on at all Variable speed function and electric arent working properly Trigger Switch Part Number 153609-00 This switch is a for the following for DW708 Cut Miter Saw Types 1, 3 4 ONLY. Product Name:Trigger Switch Part Number:153609-00 Applicable Model:For DW708 Cut Miter Saw Types 1, 3 4 ONLY. Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips:The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Colour:As Shown Material:Plastic Package Contents: 1 * Trigger Switch Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.