This kit is a mini communication kit. Intercom kits are common at home or in the office.
Technical
Power: 6 ~ 12VDC
Current consumption: 40mA (talking), 182mA (push S / W tone)
-Calling tone function-Maximum communication distance: within 50m
-PCB: 29 × 20 m (small, recommended case: FB01, multi-purpose box) / 69 × 52 mm (large, recommended case: FB03, multi-purpose box)