33 acquires the mains power through a plug 331 plugged in a receptacle 332 on the wall the control module 32 has a micro controller unit mcu 321 a storage device 322 and a string light driver 323 the mcu 321 is electronically connected to the bluetooth connection module 31 to receive the string light control command transmitted from the bluetooth connection module 31 the storage device 322 is electronically connected to the mcu 321 and memorizes multiple display modes of the string light 10 the display modes include but are not limited to the following functions for example the light bulbs 11 on the string light 10 are alternately lit are lit to demonstrate a lighting pattern according to an alignment of the light bulbs 11 are lit with the regularly varying overall luminance of the light bulbs 11 or are lit to show any other visual effect that the string light is capable of displaying the string light driver 323 is electronically connected to the mcu 321 and each light bulb 11 of the string light 10 controls each light bulb 11 to turn on or turn off and adjusts the luminance of each light bulb 11 the mcu 321 receives the string light control command from the bluetooth connection module 31 identifies a corresponding display mode in the storage device 322 according to the string light control command and controls the string light driver 323 so that the string light 10 can be operated according.