1. High-end technology MPPT solar maximum power tracking charging management chip, with trickle, constant current, constant voltage charging management2. high-frequency low-conductivity internal resistance dual MOS tubes, high-current diodes, high-efficiency flat high-power inductors, alloy current detection resistors3. The -size aluminum heat sink at the bottom ensures long-term stable operation under high current4. High-speed and efficient charging 5. Dual status indicator lights, the red light flashes when the battery is not connected, the green light is always on, the red light is on when charging, it stops when it is fully , and the green light is on at the same timeInput voltage: powered by a nominal 18V solar panel (recommended)Overcharge and float charge voltages are 14.8V and 13.55V, respectivelyOutput current: maximum constant current 3AWorking temperature: -40C~+85with overvoltage protectionWith MPPT functionColour:redMaterial:plasticSize: 4.923 x 3.437cmPackage Contents:1 x solar controller moduleOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.