A 16x2 I2C LCD display from Xiamen Zettler Electronics.
This LCD does not work with default I2C library due to its slow I2C responce. The library linked above adds some extra waits so that the device can answer to the I2C commands.
This device is manufactured by Xiamen Zettler Electronics and distributed by Akizuki Denshi Tsusho (in Japan). http://akizukidenshi.com/catalog/g/gP-05693/