Alto Internal Sounder With Tamper protected lid and mounting. Low Profile Design. 115dB sound output. Selectable alternating or continuous tone. Low current consumption. Tamper protected lid and mounting. 3rd Party Tested. Nominal Power Supply: 6-14V DC. Current Draw: 120mA MAX. Colour: White. Tamper: Cover & Wall. Material: ABS. Dimensions: 115 x 115 x 32mm. EN Grade: 3. Environmental Class: II.