The ROMEO4T line is nearly identical to the 4XT, with the main difference being the battery. Instead of the low-slung AAA, the 4T runs off of a standard CR2032 coin cell. This smaller battery offers a slightly slimmer footprint and slight weight savings while maintaining a 50,000-hour battery life. The 4T offers several flip cover options, a killflash, and four swappable reticles. The included mount comes in at absolute height, but the included spacer can be installed to bring the optic up to a lower 1/3rd co-witness.