The unit of currency is the Kenyan Shilling (KES), which is divided into 100 cents. It is not advisable to take Kenyan Shillings out of the country, as they are difficult to exchange elsewhere. Foreign currency can be changed at banks, bureaux de change and hotels. It's easiest to exchange US Dollars, Pounds Sterling or Euros. Street exchange merchants should be avoided as they are operating illegally. Opening hours vary according to bank, but generally banks in Kenya are open Monday to Friday from 9am to 3pm and on the first and last Saturday of the month. Banks and bureaux de change at the international airport stay open 24 hours. International credit cards are accepted in the larger hotels and stores, and some camps and lodges. ATMs are widely available in Nairobi and other major towns.