It has a timer/delay function.Set up a separate timed task for each channel Mainly used in automatic control systems such as automatic feeding, timed ventilation, and timed on/off of streetlightsThis eWeLink product does not currently support older router versions prior to 2013, such as TL-WR882N and TL-WR885N/WR841N V11 models. Future platform upgrades and compatibility optimizations will be implemented; please stay tuned1. Features signal indicator lights and 4 relay activation indicator lights;2. The board's power consumption is less than 1W, with a static current of 0.08A and an operating current of 0.3A.3. Control the rated current to within 10A and the switching voltage to within 250V;4. Four 10A relay outputs;5. The relay has a lifespan of over 1,000,000 cycles;6. Electrical insulation resistance: 100MΩ;7. Contact withstand voltage 1000V;8. The maximum pull-in time of the relay is 15ms.9. The maximum release time of the relay is 5 milliseconds;10. Operating temperature: -40°C to +70°C;11. Operating humidity: 40%~80%RH.(The product printed words may vary depending on the batch, but this does not affect use)Color: As ShownMaterial: PCBPackage Contents:1*4CH 10A Wireless RelayOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.