Features: Two-channel audio adapter for most DSLR cameras and camcorders, it helps to record better sound effect. Three integrated mounting shoe bases allow you to attach various microphones, wireless receivers, or others accessories, such as LED light, monitor etc. It has two mono 1/8(3.5mm) mini-jack input, one stereo 1/8(3.5mm) mini-jack input and one stereo 1/8(3.5mm) mini-jack output. Dual trim control knobs for controlling sound volume. Do not require battery for power supply. Built-in hot shoe adapter for you to mount it on camera easily.