I confirm that the jack is at the OMTP and not CTIA standard, meaning it works perfectly on my Samsung Galaxy S GT I9000 (the most recent of the Galaxy range seems to be passed to the CTIA standard, such as Iphones). Comes with lots of spare ear tips in different sizes, in black and fluorescent green, and with a clip for attaching the cord to a garment. The product arrived within 3 days.