1, expensive. Google Glass is priced at up to $1500; Nike+ FuelBand SE is priced at $149; Adidas' upcoming Android smartwatch is priced at $399.
2, short battery life. Ordinary smartwatch battery life in about 24 hours, if you open more features will increase power consumption, so users have to charge twice a day to normal use.
3, can not be used independently or incomplete functions. Many smartwatches need to be equipped with a cell phone to be able to use their functions, and consumers can't help but ask: what else can they do with it?