Let me introduce a small thing which has been on the market for a long time, a set of colorful rechargeable mini speakers. Its name is the same as its shape: Music Balloon. Whether it's a mobile phone or MP3, as long as it supports a 2.5 audio port, it will be compatible. This little thing has a built-in lithium-ion battery, which can be charged through a USB port, completely solving the problem of charging. It takes two hours to charge, but it can be used continuously for up to 4-5 hours. As for how you want to settle it, it's up to you. Available in Taobao store. Hint: The original price is about 45 US dollars.