Description: 1. Portable robotic speakers with Bluetooth wireless technology can dance with the rhythm of the music. 2. It can be connected to your phone and your personal watch for Bluetooth stereo playback via Wireless connectivity, and support the phone Bluetooth hands-free function. 3. Built-in Kalimba DSP (CVC) data processor can complete digital echo, noise, voice processing. 4. The best gift for your friends and family. It is also a robot electronic toys for kids. Specification: USB charging input voltage: 5v (500MA current) Charging time : about 2.5 hours Bluetooth version: V4.1 Bluetooth transmission distance: 10 meters Bluetooth work in the global 2.4GHz ISM, using band (2.4000GHZ-2.4835GHZ) Built-in Kalimba DSP (CVC) data processor can complete digital echo, noise, voice processing Signal to noise ratio: 90HZ-20K / 65dB Maximum power distortion: 7% Support Bluetooth hands-free function (HFP protocol) Input power: DC5V 300mAh