Consumer Protection Act Article 19

Consumers of distance sales or door-to-door sales may return the goods or rescind the contract in writing within 7 days upon receipt of goods or services without stating the reasons or be responsible for any expenses or costs, except in the case of distance sales with reasonable matters.Reasonable matters prescribed in the previous paragraph shall be proclaimed by the Executive Yuan.When traders do not provide consumers with information prescribed in the third subparagraph of the first paragraph of previous Article on matters related for consumer to rescind contracts upon receipt of goods or services, the 7 days period set forth in the first paragraph shall not be counted until the date the information is provided. The right to rescind would be deprived if the 7 days period set forth in the first paragraph has lapsed for 4 months.The contract would be deemed rescinded when the consumers have delivered or issue in writing within the period set prescribed in the first and third paragraph.Any agreement made in distance sales or door-to-door sales in violations of provisions prescribed in this Article shall be null and void.
中文原文 消費者保護法第19條
通訊交易或訪問交易之消費者,得於收受商品或接受服務後七日內,以退回商品或書面通知方式解除契約,無須說明理由及負擔任何費用或對價。
但通訊交易有合理例外情事者,不在此限。
前項但書合理例外情事,由行政院定之。
企業經營者於消費者收受商品或接受服務時,未依前條第一項第三款規定提供消費者解除契約相關資訊者,第一項七日期間自提供之次日起算。
但自第一項七日期間起算,已逾四個月者,解除權消滅。
消費者於第一項及第三項所定期間內,已交運商品或發出書面者,契約視為解除。
通訊交易或訪問交易違反本條規定所為之約定,其約定無效。

English translation for reference only; the Chinese text prevails. Not legal advice.