Wireless intercom with a range of up to 400 meters in open space, with a waterproof button.

• Signal transmission with radio frequency 433MHz
• 5-stage volume adjustment (sound level 30–110 dB)
• 58 polyphonic chime sounds available for selection
• Ability to add more buttons as needed, with the option to assign a different melody to each button
• Features an automatic learning system (passive learning) and does not require doorbell installation