The Bower Ultra-Rapid Battery Charger for Sony provides speedy and efficient battery power recovery for your rechargeable Sony NP-FM50, NP-FM55H, NP-FM500H, NP-QM71, NP-QM91, NP-QM51D, NP-QM71D, NP-QM91D, NP-F550, NP-F750, NP-F960, NP-F570, NP-F770, and NP-F970 camera batteries.