ETA is an official authorization for a Short Visit to Sri Lanka (For more info...) and is issued electronically. The ETA is introduced with the intention of providing an efficient, reliable and simplified service to those who visit Sri Lanka. ETA holders will be issued a 30 day Short Visit visa at the port of entry in Sri Lanka. The ETA will be effective from 1st of January 2012.
Upon arrival, produce your passport to the immigration officer at the port of entry to obtain the necessary clearance. It is advisable for you to bring a copy of the ETA approval notice along with you.