Ukrainian intelligence agencies have demonstrated homemade remote detonation devices, claiming that these remote detonation devices have a maximum control range of 3 kilometers. If a greater control range is needed, it can be achieved through relay communication antennas.
In fact, these remote detonation devices are all modified two-way radios, mainly used by Ukrainian undercover agents who are stationed within Russia. Usually, one device sends a signal, and the bomb has a receiving device. After the receiving device decodes the signal, it uses a relay or MOSFET switch to complete the circuit, triggering the electric detonator to explode the bomb.
Original article: https://www.toutiao.com/article/1839121442081099/
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