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Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22 Electronic scale crystal oscillator 3.2*2.5mm 3225 16M (16.000MHZ) 12PF 10PPM 20PPM 30PPM inductance SMD aluminum electrolytic capacitor 
With S5, switch S1 must operate the locks in a fast sequence, which can be any number of 10-button switches. If the incorrect button is pressed, the alarm sound and circuit are disabled for two minutes.