MANO SIM Card socket can easily reachable on the upside of the HAT. The cooling fan is designed compatible active cooling mode, the heat can be discharged in time. LED and fan both have independent switch, you can control the LED and fan separately, it will not bring the dazzing feeling when you use it in the night. NOTE: With cooling fan and ambient light : 1. compatible with compatible Raspberry Pi models that have the 40-pin GPIO header (4, 3, 2, B+) 2. Compatible the following brand Mini PCIe Modules compatible Quectel: EC25/EC21/ EC20 /UC20/ LTE-EP06 compatible Sierra: AirPrime MC Series compatible Telit: LM960, LE910V2, HE910, LE910Cx compatible Huawei: ME909s-120, ME909s-821, and more compatible Simcom: SIM7100, SIM7230, and more compatible ZTE: ZM8620, and more compatible U-Blox: MPCI-L2 Series compatible Thales: PLS62W, mPLS8, mPLAS9 3. Compatible the following brand Boards 1. compatible Raspberry Pi 4, 3, 2, B+ 2. compatible Asus Tinker Board 3. compatible Rock 64x 4. compatible Samsung ARTIK's board 5. compatible Latte Panda Material: abs colour: As Shown Package Contents: 1 x 3G/4G<E basic HAT 1 x USB 2.0 to Type-C cable 2 x IPX1 cable 1 x Screw removal tool 4 x Copper nuts 6 x Screws 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.