A ground penetrating radar includes a signal generator, a return signal processor, a gate and an antenna. During a final part of retraction movement of the pawl component, the entraining rocker being coupled to and movable with the pawl component; and during an initial displacement path of the pawl component the entraining rocker being decoupled from the pawl component and retained against longitudinal displacement in the pawl housing. Initialization data is written, on the data storage device, only to the write locations of the data storage device. The back panel may include first and second accordion folds, and first and second vertical folds. In other embodiments, the wireless telephone allows the user to carry on conversations without speaking through selection of appropriate prerecorded or generated phrases.