Loai 1 cai dau buoi. Hang loai 1 trung quoc dua qua thi truong an do, mianma. Loai 2 hang sua chua, ep kinh (chiem 90%) thay pin, thay vo thi ban qua tt viet nam, campuchia, lao.
Neu may muon mua dt cu thi tim thang nao uy tin o khau bao hanh ma mua.