cute water-filled hand warmer

The 2.5CM widened water injection port is convenient for adding water, the groove is leak-proof, and the screw-proof leak-proof cover is not easy to leak. The safety screw cap is made of excellent cold-resistant material, high-density, rotary, avoid water leakage, reinforced high-quality nut, resistant to high temperature above 120 °C, and will not deform!