Product Size: The machine size 3 dia x 10 inch. Product designed in portable size, easy for kids to carry around. Convenient to use at home or in a outdoor trip. If there is something wrong with the product you receive, please don’t hesitate to let us know. With Built-in Rechargeable Battery: Capacity: 1500mAh. Working hours: 2~3 hours in continuous work condition. Charging method: Insert the provided power cable into the DC5V port on the machine and the USB side into your own charger or computer. Before using it for the first time, we recommend you to charge the machine fully. Premium Sound Quality: This karaoke microphone also can be a speaker, and provides you great experience of sound effect. The sound is clear and soft. The microphone sound volume and echo level can be adjusted separately. It has recording, voice changer and vocal cut functions, which will give you more fun in playing. Great Compatibility: This microphone supports multiple connection modes -- Bluetooth, USB, Microphone SD Card and Aux Cable. Convenient to connect to your music devices such as cellphone, tablet, laptop, etc. Creative Design with Stylish Outlook: The microphone body is made of high quality ABS material and metal on top, with article colorful pattern. We utilize water transfer printing technology to achieve the special design. The colorful LED light on the amplifier can change with the music beat.