Built-in battery:
• 3.7V/ 120mAh / Lithium/rechargeable
Operation:
• Operating time:approx: 4hours
• Operating temperature: -20°C~+60°C
• Storage temperature: -40°C~+80°C
Mini USB charging port
Standard 2.5mm headphone jack
Four-direction button for VOL+,VOL-,
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