A low-power device is hardware built to complete a task while using very little energy. These devices are common in IoT sensors, badges, trackers, and embedded controllers that must run for months or years on a small battery, energy harvester, or limited wired supply. To save power, they often sleep most of the time, wake briefly, and send only small bursts of data.
In cyber security, power efficiency matters because an exhausted device can become invisible: it may miss alerts, stop logging, or fail to report tampering. Attackers can sometimes exploit weak power design by forcing frequent wake-ups, draining batteries, or causing repeated retransmissions. Defenders respond with careful power budgeting, resilient sleep modes, health checks, and failure states that make loss of power obvious instead of silent. In smart security systems, a low-power device is only effective if it can keep watching reliably.