Also available in 1,5 and 2 metres lengths. The new Maggi Active alarm locks, the Active Blade and Active Square come in various sizes and they can be also bought as a simple lock or as a lock and chain combo. The story is pretty much the same like in other cases: hardened steel for the loops and chains, treated to resist freezing sprays and so on.
A nice feature is that riders can use them as locks and as alarm locks by simply reversing the position of the locking loop and turning the key: the first position locks the disc or chain in place, and if you also want the alarm, just insert the loop the other way. Take out the key and the 100db alarm is armed.
The locks are tamper and movement sensitive and the alarms will go off if they receive shocks or the thieves try to haul the bike away.