Plug-in Chime for Wireless Video Doorbell Entry Chime with Adjustable Volume Music Selection Ding-Dong Door Bell Chime 433MHz Frequency (AC 90~250V) The plug-in chime will be activated when a visitor is pressing the smart doorbell. Plug-in chime is a practical tool that matches with smart doorbell, and they both provide home for you! Plug-in Chime for Wireless Video Doorbell Entry Chime with Adjustable Volume Music Selection Ding-Dong Door Bell Chime 433MHz Frequency (AC 90~250V): 433MHz frequency, compatible with wireless video doorbell.Plug-in chime, easy to use, designed for indoor use only.Different melodies for selection, meeting various needs.A chime can pair with multiple doorbells, a doorbell can pair with multiple chimes.Adjustable , low to mute, to 110dB. Note: Size and color may be slightly different due to manual measurement and different light conditons or other reasons, please in kind prevail. Thanks for understanding. Specifications: Music Selection: Support Package Weight: 100g / 3.5oz Plug: US Material: Plastic Frequency: 433MHz Color: Black/ White (Optional) Volume: adjustable, to 110dB Power Consumption: 10mW Chime Size (plug not included): 82 * 82 * 20mm / 3.2 * 3.2 * 0.8in Voltage: AC 90~250V Package Size: 9.5 * 9.5 * 7cm / 3.7 * 3.7 * 2.8in Package List: 1 * User Manual (English) 1 * Plug-in Chime A chime can pair with multiple doorbells, a doorbell can pair with multiple chimes. Plug-in chime, easy to use, designed for indoor use only. 433MHz frequency, compatible with wireless video doorbell. Different melodies for selection, meeting various needs. Adjustable volume, low to mute, up to 110dB. 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.