Remote shutter release cord (remote commander) – it is really a very useful and helpful gear for prevent vibration when taking photos under long exposures, close-ups (macro) or continuous shooting. The shutter release button of this remote cord can be pressed halfway for auto-focus and exposure metering. And, a shutter release button lock is available which for long exposures shooting and continuous shooting helpfully. Features: Prevent vibration : This remote cord can prevent vibration during long exposures, close-ups or continuous shooting. Halfway pressed button: The shutter release button of this remote cord can be pressed halfway for auto-focus and exposure metering. Shutter release button lock : A shutter release button lock is available which for long exposures shooting and continuous shooting. All electronic no batteries needed. Specifications: Model:RS-60E3 Length of cord: 90 cm ( 3 ft. approx. ) Shutter release button: Dual Stage Button (halfway / complete) Button lock: Available, Slide Style Package included: 1x Bluetooth Remote Shutter