【Convenient FM Radio】F4 FM headphones offer easy access to your favorite radio stations with automatic and manual tuning options 【One-Touch Station Memory】Save your preferred stations with a single button press for quick access to your favorite programs 【Wide Frequency Range】Tune into a broad spectrum of FM stations with a frequency range of 50-108MHz 【High Sensitivity Reception】With a sensitivity of ≤8DB, enjoy clear reception of even weak radio signals 【More Than a Radio】It can connects an external 3.5mm AUX cable (included) as a wired headset, suitable for smartphones, tablets, PCs, etc. 【Foldable Design】Compact and portable, these headphones fold easily for convenient storage and travel Specifications: Frequency range: FM 50-108MHz Battery: polymer lithium battery 650mAh Receiving sensitivity: ≤8DB 2 channel search methods: manual search/automatic search Number of stored channels: 30 Working voltage: 3V-5V Audio input port: Φ3.5mm Speaker parameters: Φ40mm 32Ω 0.25W