DROK Time Delay Relay, DC 5V/12V/24V Timer Relay Delay-Off Cycle 0.01s-9999mins Adjustable Trigger with LCD Display Support Micro USB 5V Input

Exceeded my expectations in every way! For my DIY Solar Tracker Solar Power Set-up this timer was one of the last tech items needed. I was getting concerned, however, this specific timer seemed to have the best instructions and the listing allowed me to at least ascertain it would do the job. 4.17 seconds ON every hour indefinitely. ON 4.17 seconds OFF 3595.83 seconds repeat

Look for a video on youtube to understand the controls and wiring, if you are a beginner. Excellent little controller! I use it to drip disinfectant (H2O2 12% aqueous) via an aquarium pump into my well cistern. Very precise! Nice!

I reviewed an earlier iteration (blue board), and docked a star due to poor documentation. They have clearly worked on that, and this batch has better instructions (better translation). I'm still prototyping with them, just beginning my actual build. They have worked flawlessly during prototyping. They are easily set, and the display is very nice. It is true (as others have pointed out) that it does have a fairly narrow viewing angle, centered around 45 degrees from below (as would be sitting on a desk flat in front of you). But my need for the display is mostly just to set and forget, and I intend for these to be mounted vertically just above eye-level anyway. The high and low triggers are useful, and I'm using both in one timer. I've played around almost exclusively with the P7 "signal holding" setting, which fits my need for my application (timing my generator run in my PV system) perfectly. I have 4 altogether.Hard to get five stars from me. These are awesome (and what a price)!

I Am A Fan Of DROK Items, And This Is No Exception!I Have Built Dozens Of Timers By Hand Using 555 Timer IC's, And This Blows Them All Away!The Directions Are Somewhat Hard To Understand, But Search A Video"Home Automation: How to use 7 Program 0.1s to 9999 minutes Relay Timer" And You Quickly Understand How To Use All 7 Program Variations. This Is One Of Those Items That I Will Purchase Extra Beyond My Current Needs, Just To Keep On Hand.

Relay is fairly straight forward to use. I had one issue with the high trigger and a normally closed switch. I wanted the thermostat wire and the NC switch in line with each other, so the furnace would shut off while the timer let the fan continues to run through the timer relay. The countdown timer would start when thermostat removed the signal, but as soon as it reached zero, it would start over the countdown. While testing with a voltmeter, I noticed the negative signal ground had a positive voltage of 0.05 volts during operation. When the timer reached zero while shorting the negative and high signal terminals, the relay shut off. So I had to place a diode between the two terminals for this to work. If someone has an explanation, I would be glad to hear it.I also wish the terminals held the wires more securely than they do.

Very easy to set up. It is small in size, but has numerous time delays and other functions. A well made product.

Simple to set up, easy to wire, awesome range of timing possibilities........if it worked. I know they can, I've watched youtube vids of them and they "would" be perfect for my application. However, mine was a dud, it did everything except actually trigger the on or even the off aspect of the relay. Board clicked, timer counted down, but no actual relay function. Return for exchange is a waste of my time as while it CAME to me USPS, they want me to ship it back using the UPS store and I'd spend more in gas there and back than the $14 I wasted on this item.

I tried several relays on a small project moving into production. The DROK relay works reliably compared to the others. It is more sensitive with its low level trigger and reacts appropriately, and also cuts and manages the power properly. Ordered a few sets from one of the overseas websites and was thoroughly disappointed, coming back to this relay and need to leave a very good review as it actually does its job.