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The device consisted of a main unit connected to a camera, a microphone, a battery (Li-ion, 3.7 V, 60 Wh, 16.0 Ah), a modem (EM7565 Sierra Wireless), a SIM card, a GSM antenna and a 4G antenna (Antenova SR4L002). The camera pointed outwards through a very small hole and was directed at the entrance of the building under surveillance — it was impossible to identify it with the naked eye.