Supersymmetric extensions of the standard model provides a solution the the hierarchy problem and the possibility to give observable signals at the LHC. When R-parity is broken and the right-handed neutrinos are included in the spectrum many interesting interpretations are possible. After a brief introduction of the simplest model including many useful interpretations and desirable properties, we are going to discuss possible interesting signals in some particular cases. For instance for a left sneutrino LSP, there are two dominant channels, direct production via a Z boson, or production via a W± decaying into a left sneutrino and a left slepton next-to-LSP (NLSP), with the latter decaying into another left sneutrino plus a very soft W± subproduct. From the decay of a pair of left sneutrinos LSPs of any family, a diphoton signal plus missing transverse energy (MET) from neutrinos can be present. In addition, in the case of a pair of tau left sneutrinos LSPs, given the large value of the tau Yukawa coupling, diphoton plus leptons and/or multileptons can appear.