Only 0.28 inch / 7 mm thick (60 percent thinner than the standard under cabinet lighting*). Sturdy aluminum body. One of the best in the market for its exceptional durability. Simple plug-in installation. For most of the cases, the only tool you will need is a screwdriver for the mounting bracket. Bright 840 lumen (about 20 percent brighter than most under cabinet lighting available in the market). Each individual 3.5-inch LED Puck Light has a bright 42 LED (Epistar 3528). It only consumes 3-watt maximum. Saves at least 80 percent on energy. 24 voltage offers highly energy-efficient, minimum heat contribution, longer life span, and safer. Easily control the brightness to the desired level using the inline dimmer switch. To ensure maximum safety, Modular 3.5 inch LED Puck Light and Power Supply have been certified by UL. What's Included 3 x Lightkiwi 3.5 inch Warm White LED Puck Light 1 x 12 Watt Power Supply - Link up to (4) 3.5 inch LED Puck Light 1 x Dimmer Switch 1 x 4-way Splitter 3 x 4-inch Interconnect Cable 3 x Mounting Screw *Individual LED puck light comes with pre-installed 3.2 ft interconnect cable* If you want a different dimmer type, please select from “Dimmer Type (Optional)”. For more information, use the link below to learn more about each product. Dimmer Switch for Modular LED Under Cabinet Lighting (Black) Rotary Dimmer Switch for Modular LED Under Cabinet Lighting (Black) Wireless Dimmer Switch (Dial Remote Control + Receiver) for Modular LED Under Cabinet Lighting [Dimension] 3.5 Inch LED Puck Light 3.54 x 0.28 Inch. (90 x 7 mm) 12 Watt Power Supply 2.70 x 1.92 x 1.04 Inch (68.5 x 48.78 x 26.42 mm) Dimmer Switch 3.29 x 1.08 x 0.44 Inch (83.56 x 27.43 x 11.18 mm) 4-Way Splitter 1.64 x 1.30 x 0.59 Inch. (42 x 33 x 15 mm) Hardwire Installation If you plan to use a wall dimmer switch, you need to do the hardwire installation with a dimmable transformer, instead of the included power supply which plugs into a wall outlet, due to the voltage difference between the wall dimmer switch (110V) and LED light panel (24V). The inline dimmer switch (24V) is incompatible with a dimmable transformer. If not used with a wall dimmer switch, a plug-in power supply (except a wall mount power supply) can be used to do the hardwire installation, but if a dimmer switch is needed, a 24V dimmer switch is required. You would need to splice the power plug from the power cord and connect it to the power source with a junction box or something similar. The wall dimmer switch (110V) is incompatible with the plug-in power supply. Power Supply Start-Up time Depends on the wattage of the power supply, the start-up time may differ. Please use matched wattage of power supplies for the best result.