A mode can be set for multiple time periods, can reach 5 time periods; With a buzzer alarm function. Additional features: Each "time period" can be set individually In specific parameter setting interface (after second step), press STOP button to switch output mode: OUT1: Start time point turns on relay, time is off relay OUT2: Outputs 1S pulse to start or end time In specific parameter setting interface (after second step), press STOP button for a while to switch ringing mode: BLL0: Ring disable BLL1: Ring enable STOP key function expansion: Relay enable mode: 1.ON: enable relay on; 2.OFF: Do not turn on relay, it is always off; Press STOP button on time display interface to switch between ON and OFF, the current status will flash, and then return to main interface. (This function is emergency stop function, press once to close closed relay) After relay is disabled, the product can be used as an alarm clock. Sleep mode: 1. C-P sleep mode: within five minutes, without any operation, the digital tube automatically shut down display, the program normal operation; 2. O-d normal mode: digital tube is always open display; Press STOP button for a while after 2 seconds to release, to achieve C-P and O-d state of switch, the current state will flash, and then return to main interface. Colour:Blue+black Material: ABS Package Contents: 1 x unit Real time relay module (Note: Batteries not included) Note: When bell rings, press any button to stop ring Only above package content, other products are not included. Note: Light and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.