IP (Ingress Protection) rating cho biết khả năng chống bụi và nước:
**Ý nghĩa IP68:**
- IP = Ingress Protection
- 6 = Dust protection level
- 8 = Water protection level
**Số đầu (Dust):**
- 0: Không bảo vệ
- 4: Objects >1mm
- 5: Dust protected
- 6: Dust tight (tốt nhất)
**Số sau (Water):**
- 0: Không bảo vệ
- 4: Splash water
- 5: Water jets
- 6: Powerful jets
- 7: 1m immersion 30min
- 8: 1.5m+ immersion
- 9: High pressure jets
**Các chuẩn phổ biến:**
**IP67:**
- Dust tight
- 1m water 30 minutes
- iPhone 7/8/X
- Basic protection
**IP68:**
- Dust tight
- 1.5-4m water 30min
- Flagship standard
- Samsung S/Note series
**IP69:**
- Dust tight
- High temperature jets
- Rugged phones
- Industrial use
**IPX8:**
- No dust rating
- Water 1.5m+ 30min
- Some phones
**Thực tế sử dụng:**
- Fresh water only!
- No salt water
- No hot water
- No soap/chemicals
- Warranty không cover
**Lưu ý quan trọng:**
1. IP68 ≠ Waterproof
2. Water resistant only
3. Degrades over time
4. Check ports dry
5. Don't charge wet
**Activities:**
- Rain: OK
- Pool: Careful
- Beach: NO (salt+sand)
- Shower: Not recommended
- Deep diving: NO
**Maintenance:**
- Rinse after salt water
- Dry before charging
- Check seals yearly
- Replace damaged seals