I have the address and phone numbers too but it appears they are out of business. I hope somebody has a set of instructions that they can share.
The 9V battery is inside of the part that hangs outside the trigger guard.
There are pics on-line of the unit....but none for sale. Google Speed Release Gun Lock. Evidently even if you take the Batt out for an extended period, it still won't open so the code is written to some type of e-prom.