Main Features for Arena P1 / Arena P3/ Arena HP3:

Nano coating material, protect from moisture, sweatMulti Channels digital signal processing technology, output better quality soundDifferent Hearing Programs, meet different requirementsGermany Digital Intelligent Chip, reduce noise automaticallyFeedback Compression System, Prevent from howling sound BetterArena P1 P3 for Moderate to Severe Hearing Loss Less than 100db, Arena HP3 for severe profound loss less than 120dbArena P1 Powered by Zinc Air Battery a13Arena P3 Powered by Zinc Air Battery a13Arena HP3 Powered by Zinc Air Battery a675Arena P1 P3 Size: 3.8 x 0.9 cm, weight only 5gArena HP3 Size: 4.5 x 0.9 cm, weight only 5g