Product sound effects: within 15 meters, the bell rings clearly. The product is composed of an electromagnet, liner and base composition, an armature, a friend of mine, product size about 100 x 70 x 125mm, instrument working voltage: DC3 ~ 6V. DC resistance of solenoid coil is 10 ~ 20; adopting 55mm domestic iron bell bicycle bell cap; lining board, the base is made of plastic.
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