Check the listing for details. ECCO SA950 Back Up Alarm,Self-Adjusting,82 to 102dB 3WRT4. Condition: New. Listed at 72.65 USD. Vehicle Backup Alarm, Alarm Type Self-Adjusting, Alarm Tone Type Tonal, Maximum Sound Level 102 dB, Operating Voltage 12-24V DC, Minimum Sound Level 82 dB, Overall Length 4 in, Overall Width 1 5/8 in, Overall Height 2 13/16 in, SAE Type Rating Not Applicable, Connector Type 8-32 Uni Stud Connector, Mount Type Bolt, IP Rating IP65, Series 500 Series, Speaker Direction Forward-Facing, Vehicle Class 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, Color Black, Housing Material Nylon, Current 0.4 A SMART ALARM(R) from ECCO is a self-adjusting back-up alarm. This alarm constantly measure ambient noise and adjust the sound level, creating a volume that is safe. Eliminates the need for constant manual adjustment and helps prevent intentional alarm disconnection. Reverse mounted speaker and sealed epoxy.