Answer: The last two digits of IP represent the dust-proof level and waterproof level respectively. Neon light strips commonly use IP65/IP67/IP68; IP65: anti-dust + anti-spray water, suitable for indoor and outdoor dry/light rain scenes (such as balconies) , store sign); IP67: dustproof + short-term water immersion (30 minutes within 1 meter), suitable for terraces and flower beds next to water features; IP68: dustproof + long-term immersion underwater, suitable for swimming pools, waterscapes, and wet areas of underground garages.