I have an iphone, but I don't always like to listen to music when I run. I do have a GREAT watch! I have a Timex Ironman watch with a timer that I use. I've been using basically the same watch for about 10 years. The watches I linked are listed at $70+. I am usually able to find ironman watches at Walmart for about $35.
http://www.timex.com/collections/ironman-sleek (in case the link didn't work)
When I first bought the watch, it had an interval mode where I could set the timer to go off at 4 minutes and 1 minute (or whatever I wanted for that particular run). But the last time I bought the watch (they seem to last about 2 years) I wasn't able to find one with the interval timer at the price I wanted to pay. It does still have a timer, so I use that and watch it during the "walk" part of my run.
So if I want to run for 5 minutes and walk for 1 minute, I'll set the timer for six minutes, walk a minute watching the timer, then run the next five minutes until the watch dings, walk a minute, run five, repeat.
I love this watch. I use it to time "tidy up" sessions around the house. I use the 3 alarms to wake me up, remind me to pick up kids from this or that activity, and as a reminder to get dinner started. I use the Chrono mode to time my entire run. I use the timer for all kinds of stuff in addition to running - remembering when to move the sprinkler, or when to leave the house before practice, or to check on to cookies.
Happy Running!
wendy