Long-lasting battery life: a large-capacity 1200mah lithium battery, which can last up to 3 hours of use. High-definition call: Built-in high-definition microphone, intelligent noise reduction without delay, easy to receive mobile phone calls. Wide range of applications: Our speakers have a very wide range of applications, such as family karaoke, square dance, morning exercises, stores, shopping malls, stalls, and so on. FM Radio: It can receive FM radio with clear sound, music, opera, news, and spend leisure time. Tandem technology: Two speakers can be connected at the same time, dedicated to independent output for left and right channels, realizing surround sound.