The Xiaomi Beard Trimmer 2 is a grooming tool that offers 40 length settings and 0.5mm trimming precision. It has a self-sharpening, stainless steel blade and two comb accessories (0.5mm - 10mm and 10.5mm - 20mm). The trimmer has a hydro-resistant body and a detachable blade head, making it fully washable. It has a Type-C charging port with an LED screen display, and it takes 2 hours to fully charge, providing 90 minutes of cordless runtime. The trimmer can be used corded or cordless. It also has a travel lock feature to save battery while traveling.

Positive aspects of the Xiaomi Beard Trimmer 2 include its 40 length settings, 0.5mm trimming precision, and self-sharpening, stainless steel blade. The hydro-resistant body and detachable blade head make it easy to clean. The Type-C charging port with an LED screen display and the 90 minutes of cordless runtime are also convenient features. The trimmer can be used corded or cordless, and it has a travel lock feature to save battery while traveling.

Negative aspects of the Xiaomi Beard Trimmer 2 are not mentioned in the search results.

The materials used in the Xiaomi Beard Trimmer 2 are not explicitly mentioned in the search results. However, it is stated that the trimmer has a hydro-resistant body and a detachable blade head, and the blade is made of stainless steel.