1. The sound system for real double track independent output of the speaker system, the sound quality beautiful pure, can be directly insert USB, TF card play MP3 music; Still can directly with the PC and laptop computers, MP3, MP4,, FM radio, apple mobile phones, such as any have audio output devices connected to use. 2. The speaker system USES high fidelity design, make sound natural exquisite. 3. The light music rhythm with colorful dynamic changes. 4. The large capacity external lithium battery power supply (1000 MA). Technical parameters: Frequency response: 90 HZ-20 KHZ The power rating: 2 * 3 W The dry letter than: > 80 dB. Specifications: 11 * 9.5 *9.8 cm Outside the box sizes: 51 * 29.7 *32.4 cm Hair net weight: 16.8/15.5 kg Packing number: 30 pcs.