Important Notice: â–¶ The light will not ON during recording. It is normal that the light will not always keep on after powered on and it will still keep off during recording. When you switch "off" to "on", the light will shortly flash then be off for power saving. â–¶Before installing the battery, remove the insulating layer on the outer layer of the battery and install the battery correctly.â–¶ This microphone is only suitable for 3.5mm interface devices. Some Eos M Canon cameras without 3.5mm MIC socket are not suitable. If you are not sure whether your device is suitable, please contact us immediately and tell us your camera model. â–¶If the microphone is placed next to the speaker, it may produce whistlers. If happened, please keep the microphone far away from the speaker, or reduce the volume of the speaker.â–¶The tape change pick up mode switch settings can produce noise. â–¶Please switch off the microphone when you do not use it. Specifications: Material: ABS Plastic Item Size: 5.3*1.2*2.2in(L * W * H) Response: 30-15000Hz Sensitivity: -40dB(0dB=1/VPa at 1 KHZ) Length of Cable: 7.9in Output Impedance: 200 Ohm Signal-to-noise Radio: 76dB(1 HKZ at 1 PA) The Longest Level: 120dB at 1 HKZ Harmonic Distortion in 1% or Less) Power Supply: 3V DC Type: MS(Mid-side) Stereo Wire Power Requirement: 3V CR2 Battery Battery Life: About 800 Hours( at room temperature, the use of packing attached 3V CR2 lithium battery) Compatible Model: for any other D-SLR cameras which have 3.5mm MIC socket and standard shoe Usage: 1.Attachment will slide adapter to connect to the camera fixed on the slide rail microphone. 2.After confirm the camera closed, connected to the microphone L mini stereo plug the camera microphone input port. Package Included: 1*Microphone for camera 1*Battery 1*User Manual