Some swimmers have found a waterproof MP3 player with earbuds as an alternative to a Finis Tempo Timer.
http://www.totalimmersion.net/forum/...read.php?t=749
The only problem is finding a reliable waterproof MP3 player with earbuds that won’t fall out while swimming.
The cost of a waterproof MP3 player with earbuds is also considerably more expensive than a Finis Tempo Timer.