The Lobster Elite Liberty tennis ball machine is a great training partner for beginner and intermediate players. It has a ball capacity of 150 and will send down balls at speeds from 32-129kph (20-80mph) and is good for practising against heavy top and back spin. Balls can be projected at angles from 0-50 degrees and horizontally from one corner to the other of the court in a random pattern to practise a full range of shots. The feed rate can be selected between 2 and 10 seconds and the good battery life means playing time between charges can last up to 4 hours. The portable machine has oversized wheels and an extended handle to make moving and storing it easier.