It is a universal manual, for all OLED boards. Cause that's how Virtue does things...
Each lithium-ion pack incorporates circuitry protection, combined with a voltage regulator on the board to increase performance (compared to a standard 9 volt) over the life of the battery. This will offer more reliable and consistent power to the gun as the solenoid and eyes receives a consistent regulated voltage.
Lighter weight than a 9volt.
Memory-free recharging, saves a significant expense related to buying and replacing 9volts over the life of the battery.
Integrated Mini-USB port for charging.
Generally a good ideal to read a product description, before buying an item.