Data was collected in the late 1990's from the Red Lô Lô people (autonym: [mã53 tsi53]) by Jerold Edmondson in Yên Minh District, Hà Giang Province, Vietnam. The informant was Ms. Lò Thị Mi, 28, of Yên Minh Township (Xã).
The tones are /44/, /53/, /35/, /31/, /312/.