1. High-end MPPT solar maximum power point tracking charging management chip with trickle, constant current, and constant voltage charging management 2. High-frequency low-conductivity internal resistance dual MOSFETs, high-current diodes, high-efficiency flat high-power inductors, and alloy current detection resistors 3. Compact aluminum heat sink at the bottom ensures long-term stable operation under high current 4. High-speed and efficient charging 5. Dual status indicator lights: red light flashes when battery is not connected, green light stays on when connected; red light on during charging, turns off when fully charged, and green light turns on simultaneously Input voltage: designed for use with a nominal 18V solar panel (recommended) Overcharge and float charge voltages: 14.8V and 13.55V respectively Output current: maximum constant current 3A Working temperature: -40C to +85C Features overvoltage protection Includes MPPT function Color: red Material: plastic Size: 4.923 x 3.437 cm Package Contents: 1 x Solar controller module Note: Light reflection and different display settings may cause slight color variations between the product image and actual item. Measurement allows an error of +/- 1-3 cm.