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The l39bc 50/01 is a compact 6 W speaker with a round plastic mask. It has excellent audio performance, built-in mounting clip, easy to install in line. The front part of the speaker is IPx4 waterproof, so it can be installed in a moist environment. The basic function LBC 3950/01 is equipped with a round plastic mask with a plastic edge, and the surface is covered with a beautiful and fashionable RAL coating. The fashionable and beautiful shape of loudspeaker can be perfectly integrated with modern interior decoration and lighting equipment and coexist harmoniously. The speaker has an ultra-wide open Angle, which means that only a small number of speakers can cover the desired area. Wide frequency range can achieve better voice and sound playback effect. In addition, the speaker is equipped with a 100v matching transformer, and the jumper connector on its primary winding allows the user to select full power, half power and one-eighth power. The front of the speaker (with a special paper speaker) is IP 4 waterproof and can be installed in a moist environment, such as a bathroom, sauna, atrium and swimming pool. All Bosch speakers are certified to meet IEC 268-5 power handling capacity (PHC) standards and can operate continuously for 100 hours at rated power. Bosch has also conducted simulated acoustic feedback exposure tests to ensure they can withstand twice the rated power in a short period of time. This ensures high reliability of the speaker under extreme conditions, improves customer satisfaction, extends service life, and significantly reduces the probability of failure or performance degradation. All plastic parts are made of high strength ABS flame retardant material (in accordance with UL 94V0 standard). Security in accordance with EN 60065 standard waterproof conform to EN 60529, IPx4 certification European CE standard area conformance statement installation/configuration speakers built-in clip, users can easily should be fixed in the hole in the ceiling. The ceiling can be between 9 and 25 mm thick. In addition, a template is provided for accurately marking holes in the ceiling. The user can wire the cable through a junction box with a push - in terminal to install it without using any special tools. The junction box can also be used for loop wiring. The attached transformer provides a 6 W rated output power, and can also be easily changed with color conductors and junction boxes to provide different power.