Efest SLIM K1 Intelligent Universal Battery Charger Compact design.

Features 

Fast Charging Mode: 1.0A
Auto Detect Charging Function
Low Voltage Activation Function
Short Circuit Protection
Reverse Polarity Protection
Over Charging 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

Compatibility 

3.6V or 3.7V Cylindrical Lithium Ion Battery
10440, 14500, 14650, 16340, 16650, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 25500, 26650, and More!
Specifications 

Input: DC 5V 1A
Standby Current: <20mA
Activation Current: 50mA - 100mA
1.0A CC Current: 1000mA ± 10%
Auto Recharge Voltage: 4.10V ± 0.10V
Auto Cutoff Voltage: 4.20V ± 0.05V
CV Cutoff Current: <100mA
Operation Temperature: 0°C ~ 40°C

Package Contents

Slim K1 Charger Body
USB Cable
Warranty Card
User Manual

**PLEASE NOTE THAT THERE ARE NO BATTERIES INCLUDED WITH THE CHARGER. ANY PICTURES OF BATTERIES SHOWN IN THE IMAGES ARE SOLELY FOR DEMONSTRATION PURPOSES ONLY