PL - 390 basic technical indicators. Frequency range/tuning step - 64-108 MHz frequency modulation (FM); Smart step 0.01 MHz / 0.1 MHz; Can customize the frequency coverage: 87~108MHz(applicable to other countries except Japan, Germany, Russia standard); Germany: 87.5-108 MHz, Japan: 108-108 MHz, Russia: 64-108 MHz (including the part of the campus broadcast channel and domestic 2-5 television sound), - short wave (SW) 2300-21950 kHz; Smart step 1 kHz / 5 kHz - wave (MW) in 522-1620 kHz; Smart step 1 kHz / 9 kHz, suitable for Asia, Africa and Europe, 520-1710 kHz. Smart step 1 kHz / 10 kHz (suitable for North America) - long wave (LW) 153-513 kHz. Smart step 1 kHz / 9 kHz; Noise limit sensitivity, frequency modulation (FM) (S/N = 30 db) is better than 3 uV short wave (SW) (S/N = 26 db) is better than that of 20 uV medium wave (MW) (S/N = 26 db) is better than that of 1 mV/m long wave (LW) (S/N = 26 db) is better than 10 mV/m; Amplitude modulation bandwidth (BW) choice: 1/2/3/4/6 KHz low selectivity, frequency modulation (FM) > 60 dB (plus or minus 150 KHz) short wave (SW) > 60 dB (BW = 3 KHz, + / - 5 KHz) medium wave (MW) > 60 dB (BW = 3 KHz, plus or minus 9 KHz) long wave (LW) > 60 dB (BW = 3 KHz, plus or minus 9 KHz). FM stereo separation degree: better than 35 dB low power output distortion (10%) : horn: 180 mW or higher x 2 headphones: p 10 mW / 32 stereo headset several low store memories: a total of 550 frequency modulation (FM) 100 short wave (SW) 250 of the 100 mW (mW) long wave (LW), 100. Double wake model: radio rings at, buzzer sooner. Static electric current, frequency modulation (FM) < 25mA short wave (SW) < 27 wave (MW) < 23mA, long wave (LW) 23mA shutdown standby< 90uA; Horn specifications: 57 mm diameter / 8 impedance/power 0.25 W x 2 paper plates horn; Power supply: battery power: 3 x R6 (AA) dry and rechargeable batteries, external power switch: USB specification/DC 5V >/= 250 mA.