Touch Sensitive Dimmer Switch # The brightness of the puck lights can be adjusted from 0 to 100 full brightness steplessly, with the inline on/off touch dimmer. Short press: On and Off. Long press: Dimming. Note: can not use existing wall dimmer switchs for dimming! High Lumen Output # The high lumen output LEDs provide sufficent illumination for accent lighting, enhancing your kitchen or diplay cabinet lighting. Well Constructed # The puck lights are well designed and constructed. The lamp shells are made of quality aluminum. Aluminum lamp shell is much more stable and has much better heat dissipation than plastic. This allows the LED chips to have a longer working lifespan.