Designed specifically for use with the 8198 (sold separately) [NOT for use with 8188] Identical in appearance and acoustical output to the 8198 IP speaker Daisy chain up to three (3) satellite speakers to the primary 8198 IP speaker Requires 8198 SIP PoE+ SIP speaker and patch cables (not included, purchase separately) For humid locations, add the optional 8188MEM. Consider mounting bracket 818XTBR or 81X8T2X2 for safety applications or earthquake prone areas