Features:TW-830/N3 supports single， continuous， bulb， delay and timer planning shooting modes.Delay shooting can be set the time: delay time is 1s to 59s.Set number of shoot is 1 to 99 pictures or unlimited.Timer planning mode can be set the time between 0s to 99h 59m 59s.It can be used as normal shutter release when this product without battery.TW-830/N3 use LCD display to show functions， it is easy to understand and operate.The product surface is using high-end stain finish.The plating is inlaid around the button.Suits for: Canon EOS 7D 5D Series 1D Series 50D 40D 30D 20D 10D. Specifications:Type: Timer Remote ControlMode: TW-830/N3Time delay: 0s to 99hrs 59min 59s Interval Timer: 1s to 99hrs 59min 59s Exposure Timer: 0s to 99hrs 59min 59s Number of shots: 1 times to 99 times or unlimited timesPower: 2 * AAA batteries (not included)Item size: 14.6 * 4 * 2cm / 5.8 * 1.6 * 0.8inItem weight: 55g / 1.94ozPackage size: 16 * 8 * 3cm / 6.3 * 3.1 * 1.2inPackage weight: 127g / 4.5ozPackage List:1 * TW-830 Shutter Control 1 * Cable1 * User Manual(English & Chinese)