2-Way Voice Intercom Wireless Doorbell System Battery Cable There is a free length

There is a free length adjustment dial and up to 10 precise length settings

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2-Way Voice Intercom Wireless Doorbell System Battery Cable There is a free lengthEnhance security and communication with the NNEOBA 2 Way Wireless Doorbell System. Specifications: Wireless Frequency: 467. 637 MHz Distance: 200 meters Indoor Machine Voltage Range: USB Power Supply Power Supply: 4 x AAA Batteries (Not Included) Working Time: 4 months Working Temperature: 20C ~ 50C Size (Indoor Outdoor Unit): 10 x 6 x 1. 6 cm Package Size: 17 x 12 x 2 cm Package Weight: 10g Benefits: Clear 2 way communication for security and