This appears like a small 5cm crystal lens, with a metal brace around the outside with runes carved into the metal.
This focusing emitter attaches to the palms of your Arcane Armors gauntlets when attuned, and gives your arcane armor a new weapon in which you are considered proficient. Like all Arcane armor weapons, you can use your intelligence modifier for attack and damage rolls with this weapon.
Arcane Repulsor - Range 60/120 1d10+ Intelligence Modifier Force Damage
If you have the Extra Attack feature, and hit the target with 2 attacks on the same turn, they must make a Strength Saving Throw (equal to your spell save DC) or be knocked Prone.
If you have the perfected armor feature, the damage of each blast goes up to 2d6, and the extra attack feature deals 1d4 additional damage as well.
This comes in a standard +1 (Uncommon) +2 (Rare), and +3 (Very Rare) Variety
Notes: Requires Attunement by an Armorer Artificer