Vintage Sears Early One Smoke Alarm W/ Built In Transmitter Plus Receiver RARE

Description

Both brand new. Receiver was sealed but I cut it open to make sure it was complete and that it was the receiver because there was no print on the box that it came in. It had just come with the smoke alarm so I wanted to see it and take pictures as well. Battery That is included in the smoke alarm box looks like it has corroded but it is not inside of the unit- see pics.
Vintage Sears Early One Smoke Alarm W/ Built In Transmitter Plus Receiver. (RSD Remote signaling device model number 139. 57018 )
Condition is “New”. Shipped with USPS First Class.