My Lidl one has 3 pre-programmed settings... 180 secs (3 mins), 300 secs (5mins) and 480 secs (8 mins). You can buy specialist watch cleaning fluids, but for amateur use (Ie. cleaning bracelets and case parts), I always use slightly hotter than hand hot water to help start the grease melting and a few drops of detergent (washing up liquid) on the 180 second setting. This always gives me perfect results. Make sure you rinse and thoroughly dry the parts (I put mine on top of a radiator for 20 minutes) before reassembly. You will see an accessory in the pic that looks like a bridge...this is to fit a watch to so that the head stays above the fluid while the bracelet is submerged, but I wouldn't trust this not to fall over when the machine starts...far better to remove any bracelet from the watch first. Others may use different methods and timings.