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Features: Modern and stylish design. Bionic comfortable button. Easy to add additional transmitters or receivers. Specifications: Color:white Diameter: 7 cm/ 2.75 inches Battery type:12V 23A Working environment:minus 30 ℃ ~ 70 ℃ Power Consumption:under 100mW Frequency:433.92Mhz plus or minus 200KHZ Transmission distance:greater than 150m Package Content: 1*pet transmitter NOTE: Dear customer, thank you for buying from us. We recommend that you purchase the Wireless doorbell firstly. If you are satisfied with the item,then purchase this additional touch pad.