Calculator soldering kit

The calculator was made using a "soldering DIY kit" i found on aliexpress where it supplied the PCB board, the components (buttons, buzzer, LED's etc.) and had some basic instructions of assembly and functionality (which i couldn't read because they were in chinese). The kit solved no particular problem but it was bought to try and improve my electronics soldering skills especially precision soldering which was required to install the chip included. I only used a basic soldering iron and a spool of solder to build this since all other parts were supplied in the kit. To sum up, i think that the product was highly successful in improving my soldering skills and i had very few problems assembling it.