Promotion Keychain power bank, good quality and low price. Society is constantly developing, so that now we are very relaxed when we go out. Now when we go out, we only carry two things. One of these two things has to be brought along, and the other is a combination of multiple functions. They are mobile phones and keys. If you've been working on promotions for some time, you already know that key chains are one of the most popular promotional gifts. Do you take your cell phone and keys with you when you go out, and you don't like to take anything else with you. Why? Because you don't want to carry too much weight when you go out, what you need is simplicity, convenience and speed. So here comes the question.... Have you ever experienced the despair of going out on a mobile phone without electricity? What were you doing when the cell phone was dead? Maybe you're calling someone important. Maybe you use your mobile phone to navigate in a strange place. Maybe you are shopping and need to pay by mobile phone. So you need an emergency power supply, and it's very portable. So why not install a power supply on the key chain and distribute something that anyone will find useful and carry with them every day for the next few years? One feature of our Keychain power bank is that it doesn't need a data line to charge a cell phone. This will save you some space resources. Keychain power bank has two kinds of connectors, one can charge the mobile phone of Ios system and the other can charge the mobile phone of Android system. Want to know more about Keychain power bank? If you want to know, please contact us. We will tell you all the information about Keychain power bank.