The Bosch LC1-UM12E8 Ceiling Loudspeaker (12 W) provides high-quality sound that is suitable for both speeches as well as music reproduction. The speaker is easy to install and has multiple ceiling mounting options so you can choose the best one. The LC1-UM12E8 is designed for use in alarm systems and is approved for use in evacuation announcements. Excellent speech and music reproduction Easy installation with one grille size. Suitable for 70 V and 100 V Choice of different ceiling mounting methods Optional Pilot Tone indication Provision for mounting of the optional line/loudspeaker supervision board Bosch LC1-UM12E8 Specs: Electrical Power Maximum: 12 Rated Power: 12 / 6 / 3 / 1.5 W SPL: 100/89 dB Angle of Coverage: 170/55° Frequency Range: 50 Hz to 20 kHz Rated Voltage: 70/100 V Impedance: 418/833 Ohm Connector: 3-pole screw-terminal block Mechanical Color: White Material: Steel frame & front grille Diameter: 8.67 (22.0 cm) Maximum Depth: 4.92 (12.5 cm) Mounting Area: 7.48 (19.0 cm) Weight: 2.86 lb (1.3 kg) Packaging Info - Package Weight: 3.9 lb Box Dimensions(LxWxH): 10.3 x 10.3 x 7.1.