This is a medical grade Smart Charger for 9v batteries. It can charge one or two batteries at a time. Charge time is 3-7 hours, depending on battery capacity, and then the charger automatically switches to a maintenance charge. This charge time coupled with the auto-maintenance charge increases the life of your batteries. (Maintenance charge is similar to trickle charge, but a much lower rate to allow longer battery life.)

• Charges One or Two 9v Batteries (Two Included)
• Charges Most 9v Batteries in 3-4 Hours
• Charges High Capacity Batteries in 5-7 Hours.
• Charges NiCAD and NiMH Batteries
• Green Light is on While Charging
• Internal Computer Detects When the Battery is Fully Charged
• Green Light Flashes When Charge is Complete
• Automatically Switches to Trickle Charge
• Includes Two High Capacity 9v Batteries
• Made in the U.S.A.