1. The sliding switch engages Send mode before it is actually *locked* into the Send position. But the natural tendency is to push the sliding switch all the way into the obviously locked position, and the switch even sticks out of the housing if it is not locked into place. Experimenting with this on my Pulse units, I felt that a deliberate and delicate action was required to get the switch to engage Send without actually locking it in Send. But still though, just something to be aware of, i.e., be sure you get that clear locking/clicking into place and that the switch is flush with the housing.

2. Water (i.e., whether melting fallen snow or drinking water) that drips onto the sliding switch (e.g., via a partially unzipped jacket) can disappear below the switch and then freeze underneath it (with no visible icing), rendering the beacon incapable of going into Search or even being turned to Off (except by removing the batteries). This happened to me in the field (light snow throughout the day, temps in the 20s, wind shirt partially unzipped when skinning up), and is easily replicated at home with a freezer: takes about four minutes at room temperature with warm hands to unfreeze the switch (even with no visible icing of the switch).