The EL-9S is a fail-secure, low profile door strike designed for interior wood framed doors. Compact in size, the EL-9S easily fits into a standard wood door frame. It will function with most release activations equipment. Product Applications: The EL-9S can be used with any Aiphone intercom system that includes the door release feature. Some Applications: Residential doors, Interior office doors, Bank teller secured windows, SPECIFICATIONS: Input Voltage: 12 ~ 16 Volts AC. Current Consumption: 300 mA @ 12 Volts AC. Surge Current: Approximately 500 mA. Mounting: Flush mount into door jamb. Latch Dimensions: Should not exceed: 1-3/32"H x 11/16"W x 3/4"D.