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Premium Wireless Doorbell, 1000 FT Range, 58 Melodies, Loud Speaker. Extended Wireless Range: Operates reliably up to 1000 FT with 433.92MHz frequency. High Volume Output: Delivers up to 110dB volume with 4 adjustable levels. Diverse Melody Selection: Features 58 optional ringtones with DIY learning capability. Wide Voltage Compatibility: Receiver supports 110-260V / 50-60Hz for global use. Comprehensive Certifications: FCC, CE, RoHS, and Design Patent approved for safety. Flexible Customization: Supports full, minor, and sample-based customization options. Multi-Language Manual: Includes manuals in English, Japanese, French, German, and more.