It couldn't be simpler - Celestron has revolutionised sky observation. With the Celestron StarSense Explorer telescope and the great app, you no longer need any prior knowledge of astronomy, alignment or the Earth's rotation. Simply set up the telescope, mount the mobile, start the app, select the target and observe. Using these telescopes and the app is very user-friendly. First, the app is installed on the smartphone. The smartphone is then placed in the special holder on the telescope during observation. The smartphone's camera scans the starry sky and indicates the direction in real time with arrows in which the telescope should be swivelled. Once the position has been reached, the crosshairs light up green and the desired target; the moon, stars or constellations can be observed in the eyepiece. Dobsonian mount with 10" (254mm) Newtonian reflector with 1200mm focal length. Aperture f/4.7 Supplied with a 25mm eyepiece. Magnification = 48x Weight optics: 13.24 kg. Weight mount: 11.60 kg. Total weight: 24.86 kg. Dimensions optics: 1117.6 x 292.1 mm Dimensions mount: 673.1 x 533.4 x 533.4 mm.