Two-level shutter button with halfway or complete pressing, slide to lock. Halfway pressing for autofocus; complete pressing for taking the picture. Press and slide it to lock the shutter for bulb photography,continuous shooting or long exposure. Avoid camera vibration when trigger the shutter without touching the camera body, ideal for macro photography. No battery required. Compatible with Canon EOS 30D EOS 60D, etc. Cable length: 5m.
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