Dual Gigabit Ethernet Base Board For CM4:Mini, Practical And Neat Metal Case:Better Protection For The Base Board, Comes With Cooling Fan For Efficient Heat Dissipation Precise Cut-Out With Clear Label:Each Cut-Out Is Completely Aligned With The Connector Magnetic Design:Magnetic Removable Top With The Location Columns, Easy To Fix And,Better Protection For The GPIO Pins Heat Dissipation Design:Metal Case For Large Area Thermal Conductivity And Heat Dissipation,Built-In Speed-Adjustable Fan With Cooling Fins, More Efficient Colour:As Shown Material:PC Due to different batches, there may be differences in product appearance and printed text, which not affect use Package Contents: 1 x CM4-DUAL-ETH-MINI ( NOT include CM4 ) 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.