Half Shell/Full Shell
Features at a glance: Multi-band Adaptive Directionality TriState Noise Management Voice Aligned Compression Up to 4 customizable programs Automatic microphone matching OpenEar Acoustics Dynamic Feedback Cancellation Fully automatic operation Program sound indicators (beeps) Standby function On-set Delay
Options and accessories include a fully programmable telecoil and/or automatic telecoil, plus a Volume Control. 
| Half Shell(312) | Full Shell(13) | Peak Gain, dB (711/2cc) | 56/47 | 61/52 | | Peak Output, dB SPL (711/2cc) | 122/112 | 123/113 | | Programs | 1-4 | 1-4 | | Multi-band Adaptive Directionality | Yes | Yes | | Telecoil | Optional | Optional | | Auto T | Optional | Optional | Volume Control | Optional | Yes | | Battery size | 312 | 13 | Battery lifetime, typical (hrs.) | 120 | 220 |
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