As a laptop, Ipod, Iphone, PSP1000/PSP2000/PSP3000/PSP /NDSL/NDSI/3DS MP3, MP4 audio player. Output:5V, ≤450mA;Power:2W;Impedance:8Ω;Frequency response: 130Hz-14KHz;Audio input methods: External audio source or TF card;USB power;Fashion gift medium speakers, It sound by vibration through the office desk, furniture, wood, glass, and other media, It's low pitch is better than average small trumpet. ...