☛☛COPPER WIRE COIL DESIGN: There are copper wire coils inside the ring bell. The coils are large and all are made of copper wire for long-lasting and stable performance. ☛☛PERFECT ALARM RING: With novel and low power consumption, it can be generally applicable to factory agencies, schools, railways and indoor public places as audio and alarms. ☛☛SUPERIOR BELL: The stainless steel bell has large hammer, sturdy and durable, features good sound effect. ☛☛DUAL NUCLEAR POWER: The professional bell with dual nuclear power sounds crisp, loud, and spreads a lot. The thickened bold electric hammer lets the bell play the biggest and best ringtone. ☛☛EASY INSTALLATION: Porous distribution contributes to easy installation and hexagon socket screws for reinforced welding.