Can some one tell me a little about the m4. I have a 510 looking for a little variety maybe with more battery life
The difference between the two is that the M4 is smaller in diameter. You still have the same option of black or silver and manual or automatic. The M4 battery life for me is about 4-6 hours with more or less cont. use. If I do not use it all the time it lasts about 8 hours. I really enjoy the M4 it is my choice and the one that I use the most often, mainly for the size and the open atomizer. Unlike the 510 the atomizer is not encased in a housing, it makes it wonderful for dipping and dripping although some care is taken so that you do not flood it over the edge.
The main thing to remember is that the 510 and M4 are NOT compatible with eachother. They use different chargers as well.
I hope that some of this helps you, if there is anything else that I can help with let me know.
And remember that EVERY M4 kit comes with a FREE Battery, charger and pass
through when you place your order number here!
Thank you again
Millie