Being one of the most recognizable props on television is not the only reason why anybody would want this phaser. It's just good sense to have this kind of firepower when you're in a tight situation. Kirk and Spock settled for nothing less...
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This phaser pistol is loud. It is outright intimidating when you raise the Phaser I sight and turn the phaser up to full disruption and blast away. It's because the Phaser II is modified so that it has its own power source leaving lots of power for the Phaser I sound chip. Plus the metal side rails on the Phaser I allow more air to vent from the Phaser I - more air, more sound volume!