Ladies' inventions in a Sauna

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Three women, two younger, and one senior citizen, were sitting naked in a sauna. Suddenly there was a beeping sound, the young woman pressed her forearm and the beep stopped, 'that was my pager,' she said. i have a microchip under the skin of my arm. A few minutes later, a phone rang. the second young woman lifted her palm to her ear. when she finished, she explained, 'that was my mobile phone. i have a microchip in my hand. The older woman felt very low-tech, not to be out done, she decided she had to do something just as impressive. she stepped out of the sauna and went to the bathroom. she returned with a piece of toilet paper hanging from her rear end. the others raised their eyebrows and stared at her. the older woman finally said...well... will you look at that.... i'm receiving a fax!! What would be your invention?