Compro askari flange and panel mount sounder compro apr the compro apr is a red askari panel mount process sounder with a wide operating voltage and range of 32 tones the small size of this askari sounder allows it to be panel mounted in almost any location on equipment housings and inside and outside buildings the high ip rating allows it to be used in most environmentsapplications ideal for retail hotel and residential applications such as sheltered housing compro apr askari pane