Keychain portable speaker 1,Frequency Response: 30HZ-20KHZ 2,Supply Voltage Rejection: 80dB ... Keychain Portable SpeakerFunctions1.Support computer, usb port2.2-piece multimedia speaker system3.Tiny size occupies virtually no room 4.It is ... the sound is smooth, clear, and crisp with high quality speaker.6.It's a good choice to place it in ...