A device and method of its production for a micro-channel thermal absorber to be used as a solar thermal collector, heat collector, or heat dissipater, extruded or continuously cast in one piece or in modular segments from a metal, plastic, or glass and assembled into panels of different structures seamlessly integrated into the envelope of a building as covering layers or structural elements. The mobile device sets its RF receiver to receive the packet data burst instead of the broadcast data burst based on identifying that the neighbor cell is not a candidate for an upcoming handoff. A voltage detector may detect the output battery voltage of the battery. An envisaged application is parental control.