The PS370M4H-20/UHB Twin Plus module from Phono Solar is made of monocrystalline PERC cells in a black frame with a black backsheet. The PS370M4H-20/UHB provides a maximum 370 watts and achieves up to 20.31% efficiency under standard testing conditions. The PS370M4H-20/UHB is backed by a 12-year product warranty and 25-year linear performance warranty.