Timex M640 - Manual (Page 6)

Any clothing worn over the S+D Sensor must be dry and free of
metal.
Wearing the S+D Sensor on your upper arm
• Make sure that the belt clip is
removed. To remove the belt clip,
grasp clip and gently pop off. (Fig.
1) To replace clip line up tab on
clip with slot on sensor and gently
pop clip on to unit.
• If the armband is not attached,
slide plastic attachment with
elastic strap into the slot of the
S+D Sensor as shown. (Fig. 2)
• Slide the elastic strap through
the open end of the attachment,
and fix it in place with the hook
and loop closure.
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• Slip the sensor and strap over your
hand and onto your upper arm.
Watch must be worn on same
arm. (Fig. 3)
• Pull armband through the
adjustable end so that it fits snugly
around your arm.
Wearing the S+D Sensor on your belt
• If attached, remove armband by sliding out plastic attachment.
• Insert belt clip by lining up tab on belt clip with slot on Sensor
and pop into place.
• Wear sensor on same side of body as watch.
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Fig. 1
Fig. 2
Fig. 3