Types. The selector switch and the knobs differ from one machine to another. The washing machine can operate only with the help of the timer. Timer is generally known as the start button for the washing machine. The digital version is controlled digitally with the help of an electronic switch. Mechanical type is defined as the one fixed automatically. Digital one is a recent invention and many of the new brands have them these days. But a mechanical version is considered as the best and it helps in controlling the time for washing the clothes manually. The former is operated with the help of electronics, which basically means it's connected to electrical wires. The latter is connected to the wires of the machine and they are operated manually.
When you go to buy anything online you have to make sure you choose a reputable site and one that has a return policy, just in case the goods you buy are not right. You will need to look for signs that your chosen online store is safe and secure with the payment pages encrypting your payment details. Look for the URL starting https; the s on the end means it is secure. Another way to tell is the padlock symbol on the bottom right of the page. And don't forget to read all the terms and conditions first.