A carrying case for electronic devices comprising a substantially rectangular-shaped sleeve having an upper strap attached to two corners so that a user can wear the carrying case around his or her neck. A rigid roof shell has two posts defining a rear opening. The second decision tree is associated with a second type of audio sound and produces a second codeword. A request for a DNS lookup of a name of a host of the network is received through the secure communication tunnel. The monitoring unit has a memory, implemented in hardware as a RAM memory, having a section of each of the flows or groups of flows, and acting as a token bucket for those flows or group of flows. For positive head pressures, one or more valves may be used to prevent pumped fluid from escaping the reservoir, if desired.