Specification Brand : Life-Tech BulletPoint1 : First adjust the push plate to accommodate the size of your battery (battery not included); The push plate can be pull down fit various size battery (up to 76mm) as shown in the picture BulletPoint2 : Place the battery on the push plate and align the 2 adjustable connector pong with the battery -/+ (If you can not identify the -/+ on the battery, it is usually the first and last charge connector on the battery) BulletPoint3 : Simply plug the dock to a power oulet to start charging your battery. BulletPoint4 : Charge status indicator LED ( Red LED indicate charging, Green indicate idle) BulletPoint5 : If Red LED does not indicate, please properly adjust the 2 -/+ pongs connector with the battery -/+. If the battery have 3 or 4 charge connector, the -/+ are usually the first and last charge connector of the battery. Color : Green,Red ExternallyAssignedProductIdentifier1 : 0610708895374 ExternallyAssignedProductIdentifier2 : 610708895374 InputVoltage : 240 volts ItemName : for Nikon COOLPIX S4100, COOLPIX S3100 EN-EL19 Dock Battery Charger ItemPackageQuantity : 1 ItemTypeKeyword : camcorder-battery-chargers Manufacturer : LIFETECH ModelNumber : HDC-HS250-SDM-130 OutputVoltage : 3.7 volts_of_direct_current PartNumber : YBN1 ProductDescription : Package include: 1 dock charger; perfect for charging spare battery ProductSiteLaunchDate : 2012-01-02T21:17:34.711Z UnspscCode : 26111704