L39bc 41/11 is an economical 6 W strong directional speaker. It has a super wide open Angle and beautiful shape. The waterproof and dust-proof grade meets the IP 65 standard, making it an ideal choice for indoor and outdoor applications. Basic function the strong directional speaker has a very wide open Angle (90 degrees), which means that only a small number of speakers can cover a specific area. In addition, it has a wide frequency range and can achieve better voice and music playback effect, while excellent directionality ensures that sound is accurately transmitted to the most desired location. L39bc 41/11 strongly directional loudspeaker adopts beautiful and fashionable white coating with beautiful shape, which can be perfectly integrated with modern indoor lighting and other equipment. The color and shape of the front mask matches the existing Bosch ceiling speaker (LBC 3951/11). 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. The speaker housing is made of high strength ABS flame retardant material (in accordance with UL 94 V0 standard). Security in accordance with EN 60065 standard waterproof and dustproof in accordance with EN 60529, IP 65 standard fire retardant UL 94 where V0 standard certification European CE installation/configuration the strong directivity speakers attached white steel mounting bracket. The bracket has three 10mm round holes that allow speakers to be easily mounted on walls and ceilings. The direction of the loudspeaker can be adjusted by two screws with white plastic covers. The device is attached with a 2-meter-long, color-coded five-core cable, each color of which is connected to the corresponding different jumper connector on the speaker transformer. This allows the user to easily select full power, half power, one-quarter power, and one-eighth power during installation without having to turn the device on.