Convergent HP4000KIT Bullet HP Game Calling Kit The Bullet HP has a working range of over 200 feet. It uses internal lithium ion batteries which will last all day and are rechargeable so there is no need to ever purchase batteries. It has a built-in decoy, controllable via the app. The decoy features dual directional, erratic movement that has proven very effective in triggering responses from even the most suspicious predators.