36 melodies, 4-level volume Press the receiver button, you can select 36 kinds of beverage waterproof doorbell transmitter buttons, which are made of high-quality materials, and the waterproof level reaches the IP44 standard, which ensures the performance when opening the door when worrying about various weather conditions. [LEDFLASH] The buttons and blue LED flash on the receiver provide reminders for visitors and visitors. Product name: wireless doorbell plug: European standard specification: one or two (one doorbell button, two doorbell hosts) waterproof grade; Transmitter waterproof grade IP44 Working temperature: - 30 ℃ to+70 Cooperation frequency: 433.92MHz75KHz Receiving voltage: 100-260V/5O-60Hz (wide) Transmitter battery: 12V23 pollution-free and environment-friendly battery (certified) Ring tone: 36 Optional, learning code, DIY volume: 0-100dB, level 4 adjustable quantity: 1 doorbell button, 2 doorbell Host product color: as shown in the figure, the actual color is slightly different from the image, and can be used for different monitors and lighting effects