![Kastar 5-Pack Ni-MH 4.8V 1000mAh Two-Way Radio Battery Replacement for RadioShack 21-1914, RadioShack 21-1915, RadioShack 21-1917, RadioShack 21-1935, RadioShack 21-1936, Uniden BP38, BP39, BP40 - Walmart.com Kastar 5-Pack Ni-MH 4.8V 1000mAh Two-Way Radio Battery Replacement for RadioShack 21-1914, RadioShack 21-1915, RadioShack 21-1917, RadioShack 21-1935, RadioShack 21-1936, Uniden BP38, BP39, BP40 - Walmart.com](https://i5.walmartimages.com/asr/3162b805-374c-4c66-a303-454439d13b92.b5b1873f106ecdd0c3c5b92f285c3212.jpeg)
Kastar 5-Pack Ni-MH 4.8V 1000mAh Two-Way Radio Battery Replacement for RadioShack 21-1914, RadioShack 21-1915, RadioShack 21-1917, RadioShack 21-1935, RadioShack 21-1936, Uniden BP38, BP39, BP40 - Walmart.com
![A Centennial Celebration of Marconi & RCA Wireless Radio in West Marin, 1914-2014 - Point Reyes National Seashore (U.S. National Park Service) A Centennial Celebration of Marconi & RCA Wireless Radio in West Marin, 1914-2014 - Point Reyes National Seashore (U.S. National Park Service)](https://www.nps.gov/pore/planyourvisit/images/pic_marconi100_marshall_rca_morse_operators_1923_285x226.jpg?maxwidth=650&autorotate=false)
A Centennial Celebration of Marconi & RCA Wireless Radio in West Marin, 1914-2014 - Point Reyes National Seashore (U.S. National Park Service)
![Guest post by Keith Thrower: Technical factors affecting CW radio communication in WW1, part 2 - Innovating in Combat Guest post by Keith Thrower: Technical factors affecting CW radio communication in WW1, part 2 - Innovating in Combat](http://blogs.mhs.ox.ac.uk/innovatingincombat/files/2014/06/Marconi-Short-distace-radio.jpg)