Specifications:FM: 64-108MHzFM Receiving Sensitivity: 8UVAM: 520-1710KHzFM Receiving Sensitivity: 3mv/MProduct Size: 105 X 60 X 15 mm / 4.13 X 2.36 X 0.59 inchSpeaker in the machine: Φ40MM 8Ω 0.5WBattery: 2 x AAA battery (NOT Included)Minimum Working Voltage: 2VStereo Resolution: ≥32DBDistortion: ≤1%Output Power: ≤200MWExternal power supply: connect to DC5V power supply with USB charging cablePackage Include:1 X AM / FM Radio1 X Headphone1 X Charging cable1 X Hand strapSome instructions:(1) Support setting AM step value 9KHZ or 10KHZ, suitable for various countries (in North and South America countries use AM stepping 10K. Other countries use AM stepping 9K)(2) Manual storage operation instructions:In the power-on state, search the target frequency point through ⑦TUN+/⑧TUN-, tap the ⑫MEMO key, the LCD displays the MEMO character and the memory address number flash together, within 2 seconds of flashing, lightly press the ⑫MEMO key once to complete the manual save operation. If you don't press the ⑫MEMO key for more than 2 seconds, the system will automatically abandon the saving operation.(3) Operation instructions for replacing the saved radio station:Search through ⑦TUN+/⑧TUN- to find the target frequency point, tap the ⑫MEMO key, the LCD displays the MEMO character and the station address number flashing together, and press the ⑨M+/⑩M- key to find the station address number that needs to be replaced (Note: LCD display Only the used number of the saved station address can appear in the saved station address number), press the ⑫MEMO key once within two seconds to complete the replacement work.(4) Note that when using an external power supply, please take out the battery from the machine. In case the radio is damaged.