WTR-2 includes a Timer WTR-2(T) and a Receiver WTR-2(R). It works as a wireless timer and remote shutter release system with the Receiver connecting to the camera and the Timer controlling the receiver. Also, the Timer WTR-2(T) can work as a wired system with it connecting to the camera directly.<br> Besides the full functions of shutter release, it also features multiply timer functions: delay timer, long exposure timer, interval timer and as well as setting for the number of exposure; its timing setting can be accurate to 0.1 seconds. The WTR-2 is great for time-lapse recording of blooming flowers, astrophotography, etc.<br><br> <b>Specification</b><br> Frequency: 2.4 GHz<br>Range: 60 meter<br>Working voltage: 3.0 V<br> Standby Timer: 48 Hours<br> Batteries: 4 x AAA batteries<br> Size: Transmitter: Approx. 130 x 46 x 22 mm (5.1 x 1.8 x 0.9 in), Receiver: Approx. 85 x 37 x 31 mm (3.3 x 1.5 x 1.2 in)<br> Weight: Transmitter: Approx. 56.5g (2.0 oz) (without batteries), Receiver: Approx. 37.5 g (1.3 oz) (without batteries)