An activity recognition system for an electronic device comprising at least one sensor and a two-phase activity recognition module. In embodiments, an element manager may include an integration reference point agent to receive data from the WLAN AP in the first format. A plurality of staggered channelized bootstrap slot sections are provided in the channelized frame portion. Clock control and diagnostic logic may also be provided to selectively supply scan, functional, andor stop clock signals to the testing channels. The lock unit is configured to slide the sliding member only toward the rear end of the operating rod causing the pair of griping members to be closed when the supporting member is moved backwardly.