Easy installation with built-in mounting holes, this doorbell offers a simple setup process for quick deployment. High sound pressure level With a sound pressure level of 95 dB, this doorbell guarantees a loud and clear alarm, perfect for alerting in noisy environments. Wide voltage range operating efficiently between 3-24 V DC, this doorbell is versatile and compatible with various power sources. Compact size At only 22 mm in diameter and 10 mm in height, this compact doorbell fits perfectly in tight spaces. Durable construction Made with high-quality materials, this durable doorbell withstands continuous use without degradation. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.