BlueTech Rechargeable Battery Charger with USB Charging Port 4 modes- Charge, Discharge, Refresh, and Test 4 charging current levels- 200mA, 500mA, 700mA, and 1000mA Built-in USB charging port to charge a phone Holds up to 4 batteries- AA or AAA NiCad/NiMH- with individual compartments each with its own display screen