  Let $p$ be an odd prime number, and $E$ an elliptic curve defined over a
number field with good reduction at every prime of $F$ above $p$. In this short
note, we compute the Euler characteristics of the signed Selmer groups of $E$
over the cyclotomic $\Zp$-extension. The novelty of our result is that we allow
the elliptic curve to have mixed reduction types for primes above $p$ and that
we allow mixed signs in the definition of the signed Selmer groups.
