Two types of alarms – one audible and one visual – alert user to either a low battery or low flow, such a when a particle filter is fully loaded. LED lights on the battery indicate its charge status on and off the charger.
The 3M Versaflo TR-307N+ PAPR assembly includes a TR-302N+ PAPR unit, TR-371+ filter cover, TR-327 easy clean belt, TR-332 battery, TR-341N battery charger kit, TR-3712N HE filter and a TR-3600 Pre-Filter.

Dynabrade 45211 Sleeve for 46000, 12,000 RPM
Dynabrade 78007 1/2" W x 12" L Medium Non-Woven DynaBrite Belts, 10/pack
Dynabrade 90434 1/2" W x 24" L Medium NWN DynaBrite Premium Belts, 10/pack
Dynabrade 52474 Vane Set (4pk)
Dynabrade 82576 1/4" W x 24" L 80 Grit Ceramic DynaCut Belt, 50/pack
Dynabrade 79047 1/2" W x 24" L 36 Grit A/Z DynaCut Belt, 50/pack
Dynabrade 40321 Dynafile II Abrasive Belt Tool Versatility Kit
Dynabrade 62346 Interface Ring
Dynabrade 91544 5" Dynacut Extreme Orange Premium Film Disc, 60 Grit, Hook & Loop, Non-Vacuum, 50/Box
Dynabrade 11642 Contact Wheel Ass'y, 4" Dia. x 5/8" W x 5/8" I.D., Scoop Face, 40 Duro Rubber
Dynabrade 58418 6" Dia.Two-Hand Dynorbital Random Orbital Sander, Non-Vacuum
Dynabrade 90368 3/4" W x 34" L 80 Grit A/O DynaCut Belt, 50/pack
Dynabrade 62347 Interface Ring
Dynabrade 18570 Vane Set (4pk) 
