The headphones will automatically charge wirelessly when placed in the cradle that should have come with the package. To make sure the headphones are placed correctly, a red light should illuminate letting you know they are being charged and are properly placed.
First make sure that there are actually rechargeable batteries in the headset not non rechargeable batteries then just simply place the batteries on the cradle here is the manual for your reference thanks. Hdr 120 are apparently the same as the rs120.
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