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For a complex value $q\neq 0, 1$, and a transcendental entire function f(z) with order $0<\sigma(f)<\infty$, we study the value distribution of q-difference product f(z)f(qz) and $f^{n}(z)(f(qz)-f(z))$. Properties of entire solution of a certain q-difference linear equation are also considered.