I am looking for a small powerful battery powered transmitter that can
be programmed to transmit a

signal at a specified time.  The signal can be of any type (even
noise).  The unit will be programmed

or set to transmit at specified time for a short period of time (less
than 15 minuites) and can be

pulsed to conserve energy. The specific requirements are:

1.) Size: length + width + thickness must be less than 3 inches (not
including battery power supply).

2.) Transmitter must be capable of transmitting a signal with a
minimum power of 10 W at any

frequency between 900 MHz or 2.4 GHZ.  The transmitter will be used at
a location where there are no

laws governing the use of transmitters. No FCC restrictions.  

3.) The transmistter must be programmable so that it can be set to
transmit at a specified time and

turn off at a specified time without user intervention after the unit
is programmed.

4.) The transmitter must be battery powered.