3PCS Breast Milk Pump Flange Inserts Breast Converter Practical Breast Pump Replacement 17mm 19mm 21mm 17mm&19mm&21mm

Broad compatibility, suitable for traditional breast pump, plug-in breast pump, and wearable electric breast pump.

*2 receiver and 1 push button,talk between receiver and push button via wireless connection within a large range(outdoor bell:200m indoor bell:5-50m without any obstacle),stable transmission signal to make voice clear.

*Receiver support rechargeable battery,transmitter supports 4*AAA battery last up to Approach 4 months(transmitter 4*AAA batteries are not included).

*It's widely used for office and house, get know who is outside, and convenient for the elder who needs much more time to open the door, very practical.

*Easy to install and use,visitor presses the outside doorbell, after getting ring, you should press the button one time on receiver to get connected and then hold to speak,release it after finishing.