__link__ | Sinotimer Tm630s Manual

: Hold the Clock button and press D+ until the correct day of the week is displayed.

Before first use, the internal rechargeable battery must be charged. sinotimer tm630s manual

From the safety and FAQ sections:

Before first use, connect the timer to the power supply. It is recommended to leave it connected for several hours to charge the internal backup battery fully. : Hold the Clock button and press D+