IS Icstation Digital Clock Soldering Project DIY Assemble Kit 6 Bits AT89C2051 DC 3V-6V C51 Science School Electronic Learning Creative Season Gift Electronic DIY assemble kits are equipped with 6 digits LED module, users need to finish the assemble process, and know the basic soldering skills of electronic components. These digital clock soldering kits are programmed AT89C2051 MCU chip, precise time display, 24 hours format, supporting seconds correction, countdown clock, stopwatch, counter, hourly chime and alarm clock functions. Military grade FR-4 PCB board, thinkness 1.2mm/0.05", size 92x49mm/3.68"x1.96" (L*W), with large solder joint and pre-marked electronic components name, enable the soldering process easier for DIY beginners, science school electronic learning projects. Have a 150mm/6" power supply wire for DC 7V-12V wide oltage input, typical application is 9V, no USB power cable. Please view and download English PDF instruction in the Product Information - Technical Specification-User Manual [pdf] All messages would be replied within 12 hours as Technical Support, please rest assure to purchase and test items at Icstation. Users can check the list of components, circuit diagram and English instruction in the images; and download the English User Manual in the Product Information  -  Technical Specification - User Manual [pdf] You may these tools in practicing: soldering iron, magnifier, iron stand, tweezers, multimeter, pliers, screwdriver set, solder sucker, solder wire, clean sponge. Please make sure all components in right dirction and right place; and check whether pseudo and float welding, this is very important in practicing and testing. Any question about products please send us an message, we will provide technical supports to you in 12 hours. <span class="a-text-bold">Specifications:</span>
Working Voltage: DC 7V-12V, typical application 9V. 
Digit: 6 Bits 
PCB Board Size: 92x49x1.2mm/3.68&#034;x1.96&#034;x0.05&#034; (L*W*T) 
Accuracy: 1s <span class="a-text-bold">6 Functions:</span>
Seconds Correction, Countdown Clock, Stopwatch, Counter, Hourly Chime and Alarm Clock. <span class="a-text-bold">Feature:</span>
Military grade FR-4 PCB board, 6 digits LED module; 
Large solder joint and pre-marked electronic components name;  
AT89C2051 import master chip, accurate travel time, error range within -1 to +1 second. <span class="a-text-bold">Package Included: </span>1 x 6 Bits Alarm Clock Kit