The Efest K1 Slim charger is a no frills lightweight micro-USB powered li-ion charger. The K1 charges at up to 1A depending on the power supplied to the charger. A white LED indicates the battery is charging while a blue LED indicates a finished charge.

Features:

• Reverse polarity protection
• 10440/14500/14650/16340/16650/17650/17670/17350/18490/18500/18650/26650/26500 cells
• Features over-current, over-voltage, short-circuit, and reverse polarity protection
• Piano Wire Spring Provides Smooth Sliding Action - 15,000+ Tensile Test
• Chromium Plated Steel Cathode Insures Low Resistance While Achieving A More Precise Charging Voltage

Specifications:
DC Input: 5V 1A
Output current: 1A
Auto cut-off voltage: 4.2V+-0.05V
Auto recharge voltage: 4.10+-0.1V

Included accessories:
Micro USB Cable

-Never leave batteries unattended while charging. 
-Always make sure batteries meet the specifications of the charger before use.