F4 Digital Display Automatic Scanning Foldable FM Radio Headphone Features: 1. Soft memory foam ear pads, comfortable to wear 2. Stretchable headband design, suitable for different groups of people 3. FM50-108MHz, better reception, clear signal, bringing you a wonderful and relaxing experience 4. Small size, light weight, easy to carry Product parameters: 1. Function: one-click storage, automatic search, foldable 2. Frequency range: FM50-108MHz 3. Receiving sensitivity: 8DB 4. Frequency response: 200Hz-2000Hz 5. Search mode: manual searchautomatic search 6. Number of stored channels: 30 7. Working voltage: 3V-5V 8. Current: 32mA 9. Audio input port: 3.5mm 10. Speaker parameters: 40mm 32 ohms 0.25W 11. Dry battery version power supply: 7 batteries x 2 (no batteries shipped) 12. Lithium battery version Battery capacity: 650 mAh polymer lithium battery 13. Folded size: 4.75 x 4.75 inches 14. Net weight: 250 grams