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	Shift	Quartet	Duet	HT41899
Works with 2-3 TVs Together	✔	✘	✘	✘
Easily Swap Links between TVs	✔	✘	✘	✘
Supports up to 100 Headphones	✔	✔	✔	✘
Volume Boost Mode	✔	✔	✔	✘
Dialogue Clarity	✔	✔	✔	✘
Pass-Through Support	✔	✔	✔	✘
Charging Base & Transmitter	✘	✘	✔	✘
Headphones Work Independently	✘	✘	✘	✔
Wireless Tech	2.4G RF	2.4G RF	2.4G RF	Bluetooth