Specifications:

• Use 5: Automated curtains
• Use 4: Electric Door
• Use 3: Lighting
• Use 2: Universal
• Use 1: doorbell
• Origin: CN(Origin)
• Model Number: 251 Doorbell
• Frequency: 433.92mhz
• Connection Type: Wireless
• Chip: 1527 learning code
• Battery: CR2016x1(with battery)