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My mistake, I meant PHPHA79 not PHPHA76. PHPHA66 and PHPHA79 are both dual headphone systems. What about the battery shown in PHPHA79 vs not shown in PHPHA66. They both seem rechargeable.
The PHPHA79 is 2.4GHz Wireless Digital Audio Transmission, ASC (Automatic Signal Control)
The PHPHA66 uses infrared wireless connectivity
What is the difference between the dual PHPHA66 and the PHPHA76? Does the 76 need battery changes since that one shows a battery and the 66 doesn't?
The PHPHA76 has the advance feature of being connected to your TV Digitally. The advantage of the PHPHA66 is that two can share.