Many devices including cameras and recorders support audio recording using external microphones via an audio input or built-in microphone. Audio can be set to record along with video, offering both audio and video evidence.
Certain cameras & recorders have alarm inputs which will trigger when set up to identify potential threats
IK10 means a 10 joule impact, which in real terms the camera should survive a 10KG hammer with a swing distance of 40cm.