Standard wall microphone is the cheaper option, however it has a high sensitivity. It is used to reveal the smallest of noises, also with wall contact. Good quality/price ratio. Limpid and stable sound. Endowed with sockets for recorder and earpiece.     

Product summary:

Power supply:  9 V Battery life: approx. 50 hours Weight: 80 gr (battery included) Size: 82 x 50 x 21 mm Equipped: stereo output (Ø3.5mm) x 2