This power bank shell is equipped with an indicator light that can display the battery level and can also help lighting. It has the following protection functions including anti-reverse connection, anti-series connection, repair function and so on. Made of high-quality ABS and metal materials, it is durable, and its arc corner design conforms to ergonomic design, so it is comfortable to grip. The length of the power bank case is approx 17.2cm, the width is approx 7.9m, and the thickness is approx 2.3cm. It can hold 8 18650 batteries and there is no need of welding. In addition, it can double click the button to adjust the switch. Item Name: Power Bank Case Material: ABS,Metal Batteries: 8 x 18650 Battery(Battery Not Included) (Without Welding) Interface Type: Dual USB Output + TYPE-C Port/for Android Port Dual Input Charging Maximum Power: 5V-2A Size Details: Size: 17.2cm x 7.9cm x 2.3cm/6.77" x 3.11" x 0.91" (Approx.) The Size of the Inner Shell that Can Hold the Battery: 112mm x 68mm x 18mm/4.41" x 2.68" x 0.71" (Approx.) Notes: 1.This product is only suitable for 18650 batteries (length 6.5cm and diameter 1.8cm). The traditional No 5 and No. 7 batteries cannot be installed on it, and the size does not match. 2.Do not use the disassembled battery that has been stored for a long time and used a lot of times, otherwise it will affect the experience. 3.Before purchasing, first confirm whether the battery appearance is intact, and the voltage should be between 3.2V-4.2V. If the battery skin is damaged, it cannot be used. If the exposed part of the battery skin is damaged, contact with the spring may cause a short circuit. 4.The internal resistance of the battery will increase for a long time. Excessive internal resistance will affect the normal boost of the motherboard and the current limit of the high-power output load. 5.We are not responsible for failures and other losses caused by the installation of unqualified batteries. 6.The tip battery cannot be used. If the tip length is longer than the flat tip, the case will not go down, and the contact area of the tip positive electrode is smaller than that of the flat tip. 7.Do not use or store in a high temperature environment, you will be responsible for the consequences if you violate it. 8.Due to the light and screen setting difference, the item's color may be slightly different from the pictures. 9.Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Power Bank Case (Battery Not Included)