Motorola Original PMNN4065A NiMH 1300 mAh Submersible (IP57) Battery. The IP57 is a higher rating than the standard IP54 that helps provide first responders with high reliability in emergency situations. The number "5" stands for the dust intrusion rating, or the capcaity to withstand the effects of fine, abrasive dust particles. The "7" means a higher water intrusion rating.
