that halts the recharging process if the external coil temperature were to rise above a predetermined level. Id. at 4 n.2. We presume that the charger functions in a manner similar to chargers used for MedRadio devices under our previous rules. We emphasize that the charger must operate in compliance with our rules for Part 18 devices. 47 C.F.R. §§ 18.101-311. , infra. According to AMF, the small battery size imposes constraints on power consumption, which increases with operating frequency. AMF Comments at 6. Id. at 8. Id. at 10-13. See also ARRL Comments at 10-12 (discussing how specific elements of AMF's system design work to mitigate potential interference from incumbent operations). As AMF notes, implanted devices operate in a lower