Do you need more than one OxeDot? No, but multiple OxeDots can promote efficiency during training. 

Because the OxeDot is designed to attach and use with accessories, you may find yourself moving it back and forth among accessories throughout each training session. 

The XS1 supports up to 3 paired OxeDots at a time. 

Training with multiple OxeDots enables you to have multiple accessories already prepped and read for use with OxeDots fastened.