A liquid pump includes a top cover, a back plate, and a spacing member. The spatial compression algorithms use a wavelet transformation to map an image into a compressed image containing a smaller number of pixels that retain the original image’s information content. If the default agent has information to transfer on the bus, the default agent may take the default grant and my transfer the information without first arbitrating for the bus and winning the arbitration. The fuel pump supplies the mixed fuel into the fuel cell body to generate electricity. Responsive to wakeup from sleep, the WCD detects received signal quality.