A device and method for determining the presence or absence, or the level of, sPLA2 activity in a fluid sample. According to one aspect, a method includes receiving an indication of first presentable content associated with a first subscription service. Subsequent to the receiving of the enable message, a messaging application is opened at the mobile device. In some embodiments, the movable engagement assembly may include a movement limiting device that prevents the secondary strap from moving too far out of the bearer’s reach. The cord segments pass through the housing and between the inside surface of the housing and a toothed wedge at a lower end of the slide piece. In the transmitter, the phase control loop is shared as a phase control loop for use in the GMSK modulation mode and a phase control loop for use in the 8-PSK modulation mode.