Features: Operation: When the sun shines on the solar panel, connect the interface and the fan can be started. Up to 3000 rpm. When the sunlight is insufficient, the fan will work slowly or even stop working. Epoxy resin surface lamination, IP65 waterproof, improves durability. Product Information:(10W 2 fans) Solar panel size: 360 * 180 * 2.5mm Fan kit size: 120 * 120 * 25mm Packaging size: 380 * 210 * 60mm Maximum power (pmax): 10W Open circuit voltage (VOC): 20V Maximum power voltage (vmpp): 18V Short circuit current (isc): 0.89A Maximum power current (impp): 0.65A Output: USB, DC Product Information:(12W 4 fans) Solar panel size: 280*280*2.5mm Fan kit size: 320*320*25mm Packaging size: 380*360*45mm Maximum power (pmax): 12W Open circuit voltage (VOC): 20V Maximum power voltage (vmpp): 18V Short circuit current (isc): 0.8A Maximum power current (impp): 0.6A Output: USB, DC,Type-c Packaging list: (10W 2 fans) 1 * Solar panel 2 * fan 1 * 1/2 power cord 4 * Mountaineering buckle 4 * Sucker 8 * Ties 1 * Instructions Packaging list:(12W 4 fans ) 1 * Solar panel 1 * 4 fan set 1 * 2 meter extension cable Note: 1. Please allow 1-3cm (0.4-1.18") difference due to manual measurement and slight color variation for different display setting. 2. Due to the light and screen difference, the item's color may be slightly different from the pictures. Please understand.