Power consumption is a critical design consideration in mobile and wearable devices, since the battery is usually very small (for example 110 mAh) and the device is expected to last long times without a charge. All else equal, LRAs and BLDCs tend to be more efficient than ERM actuators. However, keep in mind that the BLDC driver inside the BLDC module may take away some of the advantages that the BLDC provides. Section 4 shows comparative data, among other metrics, in power consumption.