Patlite bk-24e-k 8-channel smart alert alarm, 32 pre-programmed, dark gray, dc12v to dc24v the panel-mount bk series smart alert stores 32 different sounds – melodies, chimes, and alarms. There are 16 groups with 8 sounds each (groups a to p), where the user can select eight sounds to make group “p” by using an sd card (sold separately – sdv-2gp recommended for best results). These sounds are suitable for noisy factories. Sounds are pre-recorded in one unit which can be used for various applications. features: maximum output level of 95db at 1m is suitable for use in a noisy factory volume output and sound groups can be changed easily by rotary switches stored inside the front cover even after installation select one sound group from a to h to playback 8 pre-recorded sounds (when controlled by bit input) a new sound group can be created from the 32 sounds with an optional sd card (sold separately) ul (component recognized), ce, and rohs compliant set the sound selection switch from “i” to “o” to test the function or sound volume sound can be played back by a bit input (8 channels) or binary input (32 channels)