This upgraded watch speaker is more functionally like a WATCH! It can tell you the time, count the time and alarm the time for you while doing sports. It will free your hands from your phone or radio or speaker. It can even be used as a selfie timer. You only need to wear it on your wrist, and enjoy your sports life more freely and breezily. Product Details: Function: LED Display, Stopwatch, Alarm Clock, Mp3 Music Player, Hands-free Calls, FM Radio, Phone Anti-lost, TF Card Support, Self-timer Output power: 3W Sensitivity: 360mV SNR ( Signal to Noise Ratio ): 80dB Charging Voltage: DC-5V 500mA Frequency Response: 100HZ-20KHZ