Speaker:1.58inches(external diameter 40mm)40hm*2 Wireless connection distance:?25M the hands -free function Multi-fuction: support wireless/ USB/ TF Card /FM Features: ?This Wireless Speaker features low power consumption, high power, strong and clear sound.Stronger anti-interference ability and more stable signal without any delay ?Stereo Sound Wireless Speaker in a mini size 118*78*38mm,compact and lightweight.Portable speaker has built in 300mAh/3.7v high-capacity battery for a long standdby time ?Portable Speaker let you experience powerful sound, enhanced bass and vocal clarity ?Stereo sound wireless speaker supports Wireless/ USB/ TF Card /FM connection ?And there are different colors for you to choose. Let your enjoy music without being uninterrupted from day to night. No matter where you go, the speaker will always be your partner.