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Sony 337 Battery for Earpieces
The Sony SR416SW 337 is a small-sized battery that is used for both hand watches and for Micro-Headset MC-2000. It's an Original Sony battery made in Japan with silver oxide that gives you better autonomy.
SONY batteries are the best on the market and are better than Varta or Renata and far better than Maxwell (Maxwell are the weakest in terms of quality).
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An Original Silver Oxide Sony Battery provides up to 4 hours of continuous operation.
Warning: The battery starts to consume once it is plugged into the Micro Headset even if you DO NOT use the system, it is consumed slower but it is consumed. This is why it is recommended that the battery be placed in the Micro Headset before entering the building where the exam is taken.
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