Strong steel lock with 6mm pushdown pin and piercing 120dB alarm.
 
It's a Lock. 
The XX6's high-grade steel mono-block construction and 6mm pushdown-locking, hardened-steel locking pin give it the broadest fit profile. A freeze-spray proof, pick-proof key & barrel make it the best portable security for your scooter, e-bike or motorcycle. Pair with XXA Cable & Adaptor.
And an Alarm.
Shock & motion sensors trigger a piercing 120dB anti-theft alarm powered by a single CR2 long-life Lithium battery. Self-arming, with no on-off switch, re-sets to armed mode within 15 seconds. One year battery life. The alarm module slips out for easy servicing/battery changes.
Resources: Download the XX Series User Manual. For a short video showing how the XX6 works on the brake disc, click here.