Using a Power Saving Mode (PSM) makes it so the cellular module in a device can be put to sleep. During that sleep time, the energy consumption is a few microamperes. The device will not communicate with the network during that time. If the device does want to send data, the cellular module will automatically come out of sleep mode and immediately send the desired data over the network. By arranging this sleeping time as optimally as possible, energy consumption is kept to a minimum. PSM is available with LTE M and NB-IOT.