I like it because you can choose your instrument (guitar, ukulele etc.) by repeatedly clicking on the power button. Do a web search on ET33 if you want instructions on how to use this tuner. I bought the required CR2032 button battery from a local department store for Rs. 25. The tuner works fairly well, but takes a bit longer to detect the C string on my ukuleles. Only other complaint is I received an old stock (mfg. date 2016) and MRP on the box says Rs. 302.