This is a pre-owned battery charger adapter for older Earthwise 18V NiCd battery packs (common in their cordless lawn & garden tools like trimmers, blowers, or mowers from the 2000s–2010s).

The 22V output charges 18V NiCd batteries (higher voltage for charging).

Specs from the label:
• Part number: BHY48-22.0V-400mA (often listed as BHY48 or BH Y48 variants)

• Output: 22.0V DC at 400mA (0.4A)

• Input: 120V AC, 60Hz (standard US household)

• UL-listed (safety certified: E240776)

• Polarity: Center positive (+) with the symbol shown

• It’s a switching adapter (compact black plastic brick) with a barrel connector on the end