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 40610 Electric Dynafile II Abrasive Belt Tool
3M 08302, Ultrapro Autobody Sealant, Clear, 5 oz Tube, 7000120449, 6 per case
Dynabrade 95544 Gear Grease, 2.5oz. Tube
ACS Diamond Cloth Belt, CX1250 3/8" X 24" 75U
3M 22392, Roloc Disc 361F, 24 YF-weight, TR, 3 in, Die R300V, 7000045090
3M 08301, Ultrapro Autobody Sealant, 08301, Tan, 5 oz Tube, 7100142901, 6 per case
Dynabrade 51811 .1 hp Straight-Line Pencil Grinder, Rear Exhaust, 1000,000 RPM, 1/16" Collet
3M™ 72787, Calibration Kit 529-04-48, Large, 7000052154, 1 EA/Case
3M 13714, Cloth Belt 963G, 80 YN-weight, 2 in x 48 in, Film-lok, L-flex, 7000118462, 50 per case
Standard Abrasives 32985, Aluminum Oxide Overlap Disc, 714721, 60 Grit, 2 in x 8-32 x 2 Ply, 7100116380
Dynabrade 51708 .1 hp Straight-Line Pencil Grinder, 35,000 RPM, 3/32" Collet
3M 96673, Glass Cloth Tape 398FR, White, 3 in x 36 yd, 7 mil, 7000001301
ACS Visor, Shade 5 Carrier Frame for M Series Helmets (M-307 & M-407) 
