Sony kv-27fv300 手册

Install the supplied size AA (R6) battery into the headphones.

Open the battery compartment lid by pressing and sliding the lid as illustrated. 

Insert the battery into the compartment with the positive side up and then close the lid.

When used continuously, the battery lasts: 

Replace the battery with a new one when the sound becomes weak.

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Wireless headphones are included and can be used only with Sony TV models 
KV-32FV300 and KV36FV300.

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up to 40 hours with an alkaline battery

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up to 20 hours with a manganese battery