Feature: 1.This speaker owns excellent sound quality,with perfect audio design. 2.Bluetooth audio transmission and handsfree call. 3.Bluetooth selfie while listening to music. 4.FM radio. 5.Prompt tone for any work status. 6.TF card playing MP3 and WAV format music. 7.In-built high capacity li-ion battery for power supply,long standby time. How to use: 1.Please charge over 2hrs before use,the red light will be lit when its charging. 2.Mode by default when no TF card inserts into speaker. Specifications: 1.Output power:3W. 2.Sensitivity ratio:360mv. 3.SNR:80db. 4.Input power supply:DC5V/500mA 5.Frequency:120HZ-20KHZ 6.Bluetooth version:Bluetooth V2.1+EDR Warm Notes: 1.Please charge over 2hrs before first use. 2.Music playing time has relationship with its volume. 3.Do not use it in wet or hyperthermal environment.No raining knock. 4.Its bluetooth connection or selfie will be different depending on your paired bluetooth device. 5.It can charge by DC5V adapter or pc's USB interface and flashes red light when charging. 6.Standby time can last as long as about 48 hrs. 7.It might be incompatible not to read TF card or bluetooth not paired. Package List: 1 x Watch speaker 1 x USB cable 1 x User Manual No TF card included Please read over the user manual for more details,any problem please feel free to email us,we always satisfied our dear customers. PS:Hope some kind customers who have purchsed this products to leave some unbiased reviews(photos and videos are better) to help the next new customers.We do need your opinions! Thank all customers who leave us a positive product reviews and seller feedback,it means the world for our store.