Features: Experience easy assembly with our small Power Battery Shell for simplicities and efficiency in creating their own portability charging . Wear resistant, this power battery shell offering excellent protections and durability, featuring a user friendly designing for easy assembly and compatibility with various single 18650 battery. Offers protections against overcharging, over discharging, and shortcircuits, ensuring a securedly user experience with its friendly plastic construction. For students needing constant device charging, business professional eequiring reliabled power, and outdoor enthusiasts who demand portablly energy solution during activity like camping and hiking. Perfectly for daily commutes, providing essential power to smartphones and tablets, or during travel adventure, ensuring your electronic devices remain operational without interruption. Specifications: Item：Battery Box Component: Plastic Color：Optional For 1PC 18650 battery Size: about 23x27x98mm/0.91x1.06x3.86in Capacity: 1200-3000mA Shell material: plastic Shell surfaces treatments: high-gloss Lighting: Charging red indicator light flashing Full red light long light. Discharge; blue indicator light on, output USB to charge mobile phones. Input current: DC5V/1.0A Output current: DC5V/1.0A Input charging time: 3-4 hours Applicable products: Suitable for smartphones, pad digital cameras, and other digital products. Package Includes: 1PC Battery Case note: The case not include batteries. Install 1pc 18650 battery (please be careful not to reverse the positive and negatived poles when installing the battery) Please allow 1-2cm errors due to manual measurement,please make sure that do not mind before order.