A method for managing power of a power source and a system is disclosed. The debug mode control circuit includes a latch circuit to generate a first signal by latching the debug signal, and a register circuit to generate a second signal when written with a permit code, and the control signal is generated based on the first signal and the second signal. Also provided are methods for determining the presence or absence of Syk kinase in a sample. The second sound emission portion is located at a center of the earpiece portion.