| Specifications | ER-370 | ER-340 | ER-360 | ER-380 | ER-390 | ER-500 |
| Length | 14-1/4" | 9-3/4" | 12-3/4" | 14-1/4" | 13-1/8" | 20" |
| Bell Diameter | 9-1/8" | 6" | 7-1/2" | 9-1/4" | 9-1/8" | 14" |
| Weight | 3-1/4"lbs w/out batteries | 1-1/2lbs w/out batteries | 2.2lbs w/out batteries | 3-1/4lbs w/out batteries | 3-1/4lbs w/out batteries | 7lbs, 4 oz. |
| Wattage | 16 Watts maximum | 6 Watts maximum | 10 Watts maximum | 20 Watts maximum | 25 Watts maximum | 45 Watts maximum |
| Effective Range | 800 feet | 300 feet | 500 feet | 1200 feet | 1400 feet | 3000 feet |