EDAN SD5 User Manual page 23

SD5/SD6 Ultrasonic TableTop Doppler User Manual Basic Operation
3 The lock is securely attached to the main unit. Hitch the device to a stationary object.
To unlock the main unit,
Insert the key into the lock slot. Apply a certain amount of pressure to the key and then rotate it
clockwise. The lock hook is open and you can remove the lock from the main unit.
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