Heating side is empty. Red wire connects to positive, black wire connects to negative. Generates electricity when a temperature difference is applied. Temperature difference of 20°C: open-circuit voltage 0.97 V, output current 225 mA Temperature difference of 40°C: open-circuit voltage 1.8 V, output current 368 mA Temperature difference of 60°C: open-circuit voltage 2.4 V, output current 469 mA Temperature difference of 80°C: open-circuit voltage 3.6 V, output current 558 mA Temperature difference of 100°C: open-circuit voltage 4.8 V, output current 669 mA Note: The above values are for reference only. Actual performance may vary depending on wiring configuration and use of voltage boost circuits, which may introduce power loss. Specifications: Model: SP1848-27145 Color: White Operating Temperature Range: -60°C to 125°C Thermoelectric Parameters: Seebeck coefficient (α): > 190 µV/°C Electrical conductivity: 850–1250 S/cm Thermal conductivity (κ): 15–16 × 10⁻³ W/(cm·°C) Figure of Merit (Z): 2.5–3 × 10⁻³ /°C Lead Length: Approx. 30 cm Dimensions: 4 × 4 × 0.34 cm (1.57 × 1.57 × 0.13 in) Quantity: 1 pc Note: Please allow for a 1–3 mm measurement tolerance due to manual measurement. Screen settings may cause slight color variation between the image and the actual product. Package Contents: 1 × Thermoelectric Power Module Shipping Information: All items ship within 3 business days after payment confirmation. Estimated delivery time is typically 8–12 days, depending on destination and carrier. Customer Support: For any questions, —we respond within 24 hours.