This product has two interfaces, a -speed device can the speed of two fans. The power is less than 0.1W, does not generate heat, and is a very stable product.It works for all Antminers with PWM 4-pin Fans. Fully compatible with for Bitmain with the Antminer T9 +, T9, S9, S9i, S9j, S9k, L3 ++, L3+, L3, D3, A3, Z9 Mini, Z9, S9, DR3, and WhatsMiner M1 (M3X) series.Auto adjustment simulator speed ,1 dummy fan simulator with dual plugs.Perfectly solve the problem without plugging in the problem. dual (one plug each) artificially generate 2200~6500 Fan RPM signals back to the 's control board. It can work under 5~36V.It is suggested to unplug the front fan and remove it from the so that it will not block the air flow into the . Plug the fan simulator into the front fan socket. The screen shot is the real world testing .Colour: whiteMaterial: plastic + cablePackage Contents:1 * Fan SimulatorOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.