MANO SIM Card socket can easily reachable on the upside of the HAT. The cooling fan is designed for 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 FOR Raspberry Pi models that have the 40-pin GPIO header (4, 3, 2, B+) 2. Compatible the following brand Mini PCIe Modules FOR Quectel: EC25/EC21/ EC20 /UC20/ LTE-EP06 FOR Sierra: AirPrime MC Series FOR Telit: LM960, LE910V2, HE910, LE910Cx FOR Huawei: ME909s-120, ME909s-821, and more FOR Simcom: SIM7100, SIM7230, and more FOR ZTE: ZM8620, and more FOR U-Blox: MPCI-L2 Series FOR Thales: PLS62W, mPLS8, mPLAS9 3. Compatible the following brand Boards 1. FOR Raspberry Pi 4, 3, 2, B+ 2. FOR Asus Tinker Board 3. FOR Rock 64x 4. FOR Samsung ARTIK's board 5. FOR 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.