the scanner unit whenever a transaction is made or using an EasyCard Reader located at all Taipei Metro stations. Types of cards Adult: These standard fare cards cost NT$500, inclusive of a NT$400 balance and NT$100 deposit. Purchase and add-value are available at all Taipei Metro stations, bus stations, and most convenience stores. The card can be credited to a maximum of balance of NT$10,000. Unused fees and the deposit are refundable. Student: These cards cost the same amount (NT$500), but can only be purchased from station staff with appropriate student identification. The pricing model remains the same on the Metro but is discounted on public buses at NT$12 rather than NT$15. Cardholders after October 2015 will not receive the NT$3 discount on public buses according to EasyCard Corp. Note: As of 1 May 2010, at certain convenience store chains (7-Eleven, FamilyMart, Hi-Life, OK Mart), Adult and Student cards may be purchased with NT$200 (NT$100 balance and NT$100 deposit). Concessionaire: These cards are reserved for children (under eligible legislation), seniors over 65 years of age, and disabled persons. It offers discounts depending on the service used. Taipei Pass: A special-purpose card that allows for unlimited travel on the Metro and associated bus services and unlimited trips on the Maokong Gondola. The pass is sold as a one-day, two-day, three-day, or five-day pass. It expires on midnight of the expiry date. Buses that accept the card will display a TaipeiPass identification sticker. Debit and co-branded credit cards Joint-branded cards allow for an EasyCard to be linked with a credit or ATM account to automatically add value. This allows for consumers to pay for products, services, or government fees with the card. The option remains popular with users in spite of handling fees and a limit of how much money can be added per day (NT$500). Auto-recharge applied to debit card to make up to 3 times of each NT$500 at all Designated retailers and value-adding machine at Metro stations Mobile device integration Several attempts have been made to embed EasyCard radio chips into mobile devices, enabling "transactions by phone." Users are not billed by their telecommunications accounts; rather, they can read transaction records and check balance using a supported mobile phone. Security attacks As the value of an EasyCard can be used for transactions of scarce services and products, security measures are important. EasyCard uses multiple encryption techniques to prevent illegal