Features:New updates to simplify, satisfy user needs. increase the power supply anti-reverse function. the use of isolated input and output optos, improves the anti-jamming capacity and the consumption. the last setting parameters can be canceled after power off. voltage signal across Signal terminals can be maintained for a long time. to ensure stability, industrial grade PCB board.Notice: Relay output is passive contact without load output, and it controls the on and off line.working modes selection: after plugging in, long press K1 for 2 seconds, later in modes selection: P1~4; K2 to enter mode.P-1: Monostable trigger delay, a signal to the trigger relay, the time is spent, the relay disconnect; P-2: A signal trigger and countdown starts, T1 seconds after the relay open T2 seconds, then close; P-3: Open T1 seconds, unplug T2 seconds, infinite loop. Users can set the relay time T1 and T2; P-4: The relay opens when a trigger signal, when the trigger signal disappears, the digital countdown starts, the relay closes when the time is issued.Specifications: Timing Range(Adjustable): 0.1~99.9 seconds; 1~999 seconds; 1 ~ 999 minutes voltage:DC 12V voltage signal: DC 4~20V Output Capability: Can control the load within the DC 30V 5A or AC 220V 5A Static Current: 20mA working current: 50mA operating temperature: -40-85C PCB size: 64 * 35 * 18 mm / 2.52 * 1.4 * 0.7 in (L * W * H) PCB weight: 25g/0.89oz Case Size: 68 * 40 * 2 2mm / 2.67 * 1.57 * 0.86 in (L * W * H) Product Weight(With case): 42g/1.49oz pack size: 11.5 * 7 * 2.2 cm / 4.53 * 2.75 * 0.86 in (L * W * H) Package List:1 * Delay Timer Module with Case