This wall/ceiling built-in speaker is ideal for offices, conference rooms, medical parties, cafe, schools, bathrooms, sports halls, or even in outdoor area such as patio! This speaker can be connected to each other in a single line. You can easily attach to cavity ceilings or walls using tension springs. The loudspeaker comes with a metal grille and plastic case which is simple, compact, solid and non-fading. It is designed with 30 W RMS and 180 W peak power. The matching transformer is mounted on the back. In addition, this speaker has the tweeter to direct high frequency for optimal sound. Note: This product is just a speaker, not a Bluetooth speaker. This appliance can be used by children aged from 8 years and above and persons with reduced physical, sensory or mental capabilities, or lack of experience and knowledge if they have been given supervision or instruction concerning use of the appliance in a safety way and understand the hazards involved. Children shall not play with the