You may notice that your Huawei E3276 4G LTE Mobile Internet Key is warm to the touch while it's in use. This can occur whenever the device is transmitting at a high level for an extended period of time, or when the device is jumping back and forth between networks while transmitting in a boundary area.
The Huawei engineering team has extensively reviewed industry maximum temperature standards for all materials and usage models.
There are no component reliability concerns.
The Huawei E3276 4G LTE Mobile Internet Key may get hot, but the surface temperature of the modem remains below IEC/UL safety standards (the Standard for Safety of Information Technology Equipment) for devices of this class.
If your mobile Internet key overheats and malfunctions, visit a Product Care Centre to have your device inspected