The seller There is no place for the built-in battery. Power supply: 9V DC (please make sure the power supply is 9V, lower or higher than 9V will cause problems.)

The seller Range -20℃-70℃

Selena Dear sir/madam, to choose a correct size, we advise you to choose a suitable size base on feet length measurement rather than select the size you usually wear directly. Click inside the size guide, it... Dear sir/madam, to choose a correct size, we advise you to choose a suitable size base on feet length measurement rather than select the size you usually wear directly. Click inside the size guide, it is the detailed size chart of the product and detailed guidance of measurement. The EUR size 39 is US size 8. شاهد المزيد