Color:silver Material: metal Voltage:12V Size:11CM x 6CM x 3 CM/4.3inch x 2.4inch x 1.2inch 4-channel stereo headphone amplifier HA400 4-channel stereo headphone amplifier for all types of headphones 4 high-power stereo amplifier Best sound quality can be obtained even in a high volume levels Each channel has output level Ultra low-noise 4580 operational amplifiers ensure superior tone High-quality components and exceptionally rugged construction ensure long life Ultra-compact headphone amplifier system for studio and stage applications Plug Type :US Plug,it applies to Canada, India, Japan, Mexico, Thailand, the United States, the Philippines and so on. Package Contents: 3 x Headphone Amplifier 3 x US plug Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.