the iTP A3 is one of the very smallest AAA lights you can buy. its size is down to 65mm depending on the A3 edition. and the lightest. except for form factor, size, prize and weight, the preon 1 is superior: different colors, titanium, tint options, 10yrs performance guarantee, cpf supporters membership, official part of the cpf community and 47s fanboys, FREE global shipping, clicky option, good clip.