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The radio battery "DL-1" since 1926 produced the Moscow EMZ. "DL-1" - single-tube regenerative receiver, assembled according to a simple scheme 0-V-0 with the transition to the detector. Tuning to a broadcasting station is carried out using an air-cooled variable capacitor. Feedback adjustment is made by changing the relative position of the two coils, the oscillating circuit and feedback. These coils are replaceable, cellular, are fixed in a special holder, a set of 7 cellular coils is attached to the receiver, which allows to obtain a continuous wave scale from 250 to 1900 meters. The radio is mounted in a wooden box with a lid that covers all controls and makes the receiver easy to carry. Like the receiver "BV" radio "DL1" in the absence of lamps and batteries, can be used as a detector, with a variable inductive coupling detector circuit, and also allows the acquisition of more complex radio installation. The lamp used is P-5, the anode battery is 80 V, and the filament battery is 4 V. The price of the receiver started at 37 rubles.