4.2v 0.5a Ac-dc Power Adapter For 18650 Flashlight, 3.7v Headlight Charger,. Upgrade Your Charging Solution with the FVJVYE AC-DC Power Adapter. This High-quality 4.2V Charger is Specifically Designed for 18650 Lithium Batteries, Making It Ideal for Rechargeable Flashlights and Other Compatible Devices. Whether You're at Home or On-the-go, Its Universal Input Voltage of AC 100V~240V Ensures Reliable Performance Around the World. This Power Adapter Features a Compact 3.5mm X 1.35mm DC Plug and Provides an Output of 500mA. Safety is a Priority with Built-in Protection Against Overcharging and Short Circuits. The Smart Indicator System Includes a Green Light for Standby and a Red Light for Active Charging, Switching Back to Green Once the Battery is Fully Charged. Package Includes: - 1 X 4.2V Plug Charger (Randomly Includes EU or US Plug) Product Features: - Stable Performance: Durable and Resistant to Frequent Use. - Smart Indicators: Green Light for Standby, Red for Charging, Automatic Stop when Fully Charged. - High-Quality Cord: Includes a 50cm Power Cord. - Versatile Compatibility: Suitable for 500mah-5000mah Lithium Batteries. - Plug Options: Available in EU, US, UK, and AU Plugs. Experience Efficient Charging with This Reliable Power Adapter, Tailored for Your 18650 Battery Needs..