This solar panel features a smart charger controller with six protection functions and a blocking diode. It uses A+ grade monocrystalline silicon wafers with 23% conversion efficiency and IP64 waterproofing. The LED indicator provides real-time monitoring with automatic cut-off to prevent overcharging. The price drops from $25.99 to $15.59 when you apply the coupon code "40FU8GAD" at checkout. Shipping is free for prime members or on orders over $35.