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Bosch half directional loudspeaker is a simple installation of innovative speakers, can spread consistent high quality, ensure that paging and emergency call applications provide excellent background music effect and excellent intelligibility. The speakers have excellent open Angle and high sound pressure level, you can at least cover 700 square meters of area, which makes it very suitable for ceiling high indoor Spaces, such as warehouse, transportation hub, and the exhibition hall, hypermarket and swimming pools, etc. Basic function voice alarm speaker LS1?OC100E?1 is used in voice alarm system and conforms to emergency standard. The speaker has built-in protection. In case of fire, this protection function can ensure that the damage to the loudspeaker will not lead to the circuit connected to it. This ensures the integrity of the system so that speakers in other locations can still communicate with people on time. The loudspeaker is equipped with ceramic junction box, temperature fuse and heat-resistant high temperature conductor. The material loudspeaker is made of high strength ABS TSG, and the flame retardant performance conforms to the UL 94 V0 class and the highest grade fire protection standard (UL 94 5VA). The loudspeaker is available in white and silver. The metal mask is silver white. All gold parts have been galvanized. The drive unit is an innovative sound speaker with 14 drive units and advanced positioning and filtering capabilities. Certificate and recognized safety in accordance with EN 60065 standard emergency conform to 24 / BS EN 54 ? ? eight 5839 / EN 60849 standard fire retardant accord with UL standard 94 - where V0 fire in accordance with UL 94 5 va waterproof and dustproof in accordance with EN 60529 IP 42 standard resistance to chlorine bleaching performance conforms to IEC 60068/2 ? 60 standard mechanical strength in accordance with EN 50102 certification European CE CE DOP IK 07 standard area The CPD installation/configuration is carried out through the d-type hanger ring (not attached), and the loudspeaker can be hoisted using steel wire or steel chain. A separate lm1-msb ?1 attachment may also be used for applications requiring fixed lifting to prevent speaker movement, such as rotation and swing. This attachment USES a set of galvanized mounting steel plate: ? one plate for mounting to the speaker in the center (using fixed parts)