Election type

Constitution 1980 (last amended in 2015)
ARTICLE 13
[…]
The citizens who are eligible to vote and that are residing abroad, may vote from abroad in the presidential primary elections, in the elections of President of the Republic, and in national plebiscites.
A constitutional organic law shall establish the procedure to materialize the registration in the electoral register and will regulate the way in which the electoral and plebiscitary procedures shall take place abroad, in conformity with what is established in the first and second paragraphs of article 18.

See also the following reports: 

http://www.coha.org/finally-the-right-to-vote-for-all-chilean-citizens/

http://www.bcn.cl/leyfacil/recurso/voto-de-chilenos-en-el-extranjero