Compare xena xx and abus 8000

See the size different. Xena xx6 is push lock and allows single hand application. Abus is beefy and almost undestructable.

The sensor used in xena xx is a rolling ball sensor. They called it 360 sensor and is indeed a cheaper sensor, instead of an accelerometer as what i initially thought. U can shake it and hear the metal balls inside.

The main differrence is that xena used ir sensor for arming the alarm. Abus use mechanical switch for arming  . It seems the ir sensor will consume more power and hence xena runs on cr2 lithium battery. On the other hand, abus uses aaa battery only.