Heating side is empty. Red wire connects to positive, black wire connects to negative. Generates electricity when a temperature difference is applied. Temperature difference vs. output: - 20°C: Open-circuit voltage 0.97 V, current 225 mA - 40°C: Open-circuit voltage 1.8 V, current 368 mA - 60°C: Open-circuit voltage 2.4 V, current 469 mA - 80°C: Open-circuit voltage 3.6 V, current 558 mA - 100°C: Open-circuit voltage 4.8 V, current 669 mA Note: These values are for reference only. Actual performance may vary depending on wiring, load, and use of a step-up board, which may introduce current 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 (k): 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: - Allow 1–3 mm measurement tolerance. - Monitor settings may affect displayed color accuracy. Package includes: 1 × Thermoelectric Power Module Shipping: All items ship within 3 business days after payment confirmation. Estimated delivery time is typically 8–12 days, subject to carrier and destination. Customer support: For questions, —we respond within 24 hours.