we own the original size sleep sheep when my now-5 year old be bear , and although we like the product fine , it be not a must-have . when my youngest son -lrb- now 5 month old -rrb- start show sign of colic , we buy the travel version hope that it would help he to at least rest a little while we be out and about . the product have all kind of technical difficulty - there be a timer that be suppose to allow the sound to play for either 25 or 45 minute . do not work . the machine frequently shut off after a few minute , usually right as the baby be about to go to sleep which of course wake he back up . also , I often have trouble get it to play at all and have to fiddle for 5 minute with the volume knob and try different button to get it to start . it be not the battery because we change they constantly . just a faulty unit , I be sure but for $ 25 I expect better .