The PRB-7, 10, 12, 15 & 18 contain an auto-reset circuit breaker. The PRB-9 uses a replaceable external fuse. All units use a one piece tubular belt panel for maximum strength. Standard deliver power via cigarette lighter receptacle. Quick release belt fits 28 to 50inch waist. 9 Ah, Runs 1.8 hrs. @ 50 Watts, 10 Hour Charge Time, 6.0 Lbs. (1-Pouch)<br /><strong>ATM version comes with Automatic Charger.</strong><br /><strong>XLR Version comes with 4-Pin XLR Connector</strong><br /><strong>XLRATM Version includes both the 4pin XLR and Automatic Charger</strong></p>