Feature:1. Lithium Ion Universal Charger: Compatible with 3.7V, 4.2V lithium ion rechargeable batteries. For example, 10440 14500 16340 16650 14650 18350 18500 18650 lithium li ion batteries.2. Security Protection: Undervoltage protection, overvoltage protection, overcurrent protection, over temperature protection, short circuit protection, battery reverse protection, zero volume battery repair, and excellent heat dissipation design.3. 4 Bay Smart Charger: 4 bay li ion battery charger can charge the battery separately. 4 bay can be adjusted according to different battery lengths.4. Compact and Portable: 4 bay 18650 battery charger is compact and convenient to carry, suitable for outdoor travel and emergency backup at home.5. Power Supply Method: USB plug power can be used for charging. 4 bay universal smart battery charger has stable and reliable performance.Specification:Item Type: Battery ChargerProduct Material: ABSWeight: Approx. 132g / 4.7ozPower Supply Method: USB PlugProduct Size: 135x90x35mm / 5.3x3.5x1.4inApplicable Battery: 10440 14500 16340 16650 14650 18350 18500 18650 (Not Included).Package List:1 x Battery ChargerNote:Lithium ion rechargeable batteries only, non AA or AAA batteries, non nickel hydrogen batteries.