Simple Installation - Dielectric mmersion provides a cooler environment and more stable system performance. This small device emulates fan presence in systems with no need for fans No Coding - Just plug in the fan simulator and the miner it has control over fans that do not exist. A simple plug and play option for anyone looking to start immersion cooling Easy Emulation - Plug the emulator into the primary fan port and it send a tachometer signal to the miner's controller, tricking it into believing fans are attached and working within parameters Quality Components - Each emulator undergoes a 1-hour performance test to product quality. Colour:As Shown Material:PC Specification: S21 Package Contents: 2 x Fan Speed Simulator 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.