... cell: SunPower from USAHigh efficiency:20%-22%IP 67 Waterproof Junction box:On front or backThickness:2.2-3. ... UV, withstands hail, storm and other harsh weather.3, Different Waterproof Connection box ( insert diode ).4, White and Black color available. ... resistance, withstands hail, storm and other harsh weather.4. Different Waterproof Connection box ( insert diode ).5. White and Black color available ...