Features: 18650 battery box, 3 slots parallel spring battery storage box with switching button & wire, with a length of 14cm. Black negative electrode, while the other wire is positive electrode, . Thick material, small structure, good fit, and no looseness. The contact spring adopts high-strength spring, with high elasticity, good corrosion resistance, long service life. The output voltages is equal to the voltages of the battery. Mainly used for experimental testing, factory supporting products, electronic toy, uninterruptible power supply, surveillances cameras, LED light, fan, mobile power supplies. Specifications: Material: Plastic Size: about 94x62x23mm/3.7x2.4x0.9inch Cable length: about 14cm/5.5inch Package Includes: 1Pc 3-Slot 18650 Battery Case note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.