John-Glammis It is in Thai. It says: Good product, but it is recommended to buy 1602LCD Display I2C module more. Https://goo.gl/LdLr2d

John-Glammis Here it is in Google English. Real-time clock OK with the RealTimeClockDS1307.h library and management of the SD OK with ChipSelect 10. Tests made with a 64GB microSD adapter; NB: for SD> 4GB, the CardInfo program (supplied with the lib) must be adapted because the volumesize variable used to give the size in bytes does not manage a number> 4GB. ReadWrite and Datalogger tested OK with the examples provided with the SD.h library (put CS 10 instead of CS 4). Files read OK on PC...

John-Glammis Somehow the efficiency table was not attached. Here is part of it in plain text.Please note that my instruments are not calibrated.Input Output Input power Output power, EfficiencyV ma V ma mW mW 570 4.73 1010 6840 4777 7025 300 4.80 1010 7500 4848 6512 800 4.69 1490 9600 6988 7325 420 4.69 1490 10500 6988 67