Upgraded 20 Lumen LED for bright and clear illumination. Fits multiple post sizes: 3.5'x3.5', 4'x4', 5'x5', and 6'x6'. Rechargeable Ni-MH batteries (600mAh) for long-lasting power. Waterproof IP44 rating ensures durability in all weather conditions. Energy-efficient solar panel (2V 100mA) for reliable charging.