Description: 1. Product Name: USB Hand Warmer Rechargeable Heated Fingers Safe Constant Temperature Heated Warm Gloves For Men Women 2. Material: nylon + cotton (gloves) 3. Battery material: lithium polymer battery (small volume, safe and explosion-proof) 4. Feature : water-repellent and breathable fabric, powered by the lithium battery, warm & non-slip 5. heated area: fingers 6. battery configuration: 2 PCS 7.4V / 4000MAH lithium battery (single battery capacity 3.7V / 2000MAH, including batteries) 7. Warming time : about 3 hours constant temperature warming (depending on the ambient temperature environment) 8. Size: (approx.) 1) M: width: 11.5 cm / 4.53 in; length: 28.5 cm / 11.22 in; middle finger on the wrist: 18 cm / 7.09 in 2) L: width: 12 cm / 4.72 in; length: 29.5 cm / 11.61 in; middle finger on wrist: 18-21 cm / 7.09-8.27 in 9. Kind Reminder: charge the gloves with the supplied standard charger. Not the other charger to charge the gloves.