FOLLOW THIS STEPS:-
1) Go To your whatsapp & click on the 3 dots given in right side top of the page.
2)Now click on NEW BROADCAST.
3)Select all the contacts whom you want to send message.
4)Maximum limit to add contact is 256 peoples.
5)once Broadcast will generate then leave the mesage in that.
all contacts will received message.
YOU ARE ALL SET
EmoticonEmoticon