Compact 100V ceiling speaker systems are for background music and announcements in areas with low ceilings and minimal background noise. Available in 3 sizes as a complete kit for an office, retail outlet, workshop or café where there is access to a suspended false ceiling for easy installation. UM series amplifiers have USB, Bluetooth and FM tuner and can be rack mounted in pairs or easily fixed to a wall or under a worktop. Each UM series amplifier also has a 6.3mm jack microphone input and RCA lne input for mp3 player, smartphone, computer etc. The easy-fit 5.25" metal ceiling speakers are suitable for low level background music and announcements. Using lower tappings, more speakers can be addded to the amplifier if total speaker Watts is <90% its max output power.