This is a mounting adapter cup, not a charger itself — it lets Zebra's TC7X 4-slot spare-battery charger (SAC-TC7X-4BTYPP-01) sit and charge while docked on a Zebra 5-Slot Charge Only ShareCradle instead of standing alone on a desk. It's a small accessory used in warehouse and retail deployments to consolidate battery charging onto existing cradle infrastructure for TC70, TC72, TC75 and TC77 mobile computers. The charger, cradle and power supplies it connects are all sold separately.