IWC Schaffhausen AQUATIMER DEEP TWO Operating Instructions Manual page 36

3
When attaching the bracelet, you must ensure that the horns are securely en-
gaged to prevent the bracelet coming off your wrist unintentionally.
To attach the bracelet, push down the two sides of the
horns vertically towards the lower side of the case and
into the recesses (3) until you hear and feel the retaining
lever engage.