Fanstown BTS clock 7 color LED digital alarm clock members with gem pendant Fanstown BTS clock 7 color LED digital alarm clock with BTS gem pendant Size:7.8cmx7.8cmx7.8cm,LED power,for 7 color changing funtion,client need prepare 4 x AAA batteries(not included owing to being prohibitted by airport) The 2 button cell for time displaying are included Please inform fanstown for any use instruction Nice gift for Fans