Shenzhen Changsite WH8

Overview
"All the model are the same circuit and RF module, except model names and different for color. Model : WH8, WH3.9, WH5, WH6, WH7, H8, WH9, H10, H11, H12, H13, H14, H15, H16, H17."

From the FCC photos:
 * The device is branded by BlueFire.
 * "WSL-TSSX-003", "ML-5032", "REV:3.1", and "2017-05-04" are silkscreened on the board.
 * The internal battery is labeled "-LQ 60204OP 450mAh +3.7V 1.65Wh 170529"