Some alternative film options for the Polaroid SX-70 camera include Polaroid Originals SX-70 film, Impossible Project SX-70 film, and Mint Camera SX-70 film. These films are specifically designed for use with the SX-70 camera and offer different characteristics such as color saturation and contrast.
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There is a serial number calculator here: http://www.rwhirled.com/landlist/sx70sn.htm which returned these results: The SX-70 serial number calculator has determined the following statistics about your camera: The complete serial number you entered is B403455213. Your camera has the original SX-70 shutter electronic design ("hybrid shutter"). Your camera is probably an original SX-70 or Alpha / Alpha 1. The serial number itself is: 34552 Your camera was made on February 5, 1974 during the A shift. hope this is right for your camera :)
In general a transciever is a device that is both a TRANSmitter and a reCEIVER. In practice an ultrasonic transceiver sends out sound waves at a frequency well above 20,000 cycles per second, and over a short distance will sense the reflections of these waves. Electronics attached to the receiver portion of the device are able to calculate the distance to the reflecting object. This device was used in the Polaroid SX70 made in the 1970s as part of the automatic focussing mechanism of the camera.