A fluid hammersiren can operate in fast valve mode with no leakage flow. An access control profile means is associated with each user of the computer program. Application particularly to an electromagnetic automotive key housing with a removable button battery. Thereafter, in a horizontal image period, a horizontal scanning pulse signal is outputted from a horizontal shift register to successively put horizontal switches into a connecting state to successively output the signals of the capacitors thereby to obtain a reference signal for cancellation of vertical string-like fixed pattern noises. A die cut head or skin with holes punched to match the posts is inserted into the outer member.