Rolton E500 Bluetooth Speaker 2.1-Channel Built-In Microphone Supports FM Radio 1. Multi-function in one: Bluetooth speakerBluetooth callBluetooth selfieMP3 playerradioflashlight 2. Good sound quality: smooth and supple frequency response curve, low frequency can dive down to 40Hz; drum sound is elastic and full of rhythm; high frequency can extend up to 20KHz 3. Support MP3WMAWAV lossless format triple decoding, up to 16GB TF card (the product does not include TF card) 4. The E500 audio system has a built-in microphone. When a call comes in, the music will automatically pause. You can switch to the hands-free call mode by simply pressing the Bluetooth button, and you can easily talk and chat with the speaker. After finishing the call and hanging up, it will naturally turn to the playback of Bluetooth music. 5. Three scene recording modes: call recordingradio recordingenvironmental recording 6. Wireless playback at a distance of 10 meters, farewell to restraint 7. Dual speakers, stereo loudness up to 95dB 0.5m 8. The whole machine is as light as 198g and as thin as 3cm. It can be easily inserted into your pocket or travel bag. Whether you are walking, climbing, traveling or other outdoor activities, it will accompany you wherever you go, making your journey no longer lonely. parameter: 1. Material technology: mobile phone UV technology + ABS plastic 2. Rated power: 3W+3W 3. Input power: power adapterUSB power supplylithium battery 4. Separation: 80dB 5. Distortion: 1% (3.7V, 1KHz, 1W) 6. Signal-to-noise ratio: 83dB 7. Working voltage: DC3.7V 8. Charging voltage: DC5.0V 9. Lithium battery capacity: 1500mAH (built-in) 10. Impedance: 4 11. Display: LED display 12. Speaker: 1.5 inch x 2 + passive radiator x 1 13. Audio format: MP3WMAWAV 14. Firmware upgrade: no 15. Machine volume: about 130mm x 32mm x 67mm (WxDxH) 16. Working temperature: -5-40 degrees Celsius 17. Machine net weight: about 198g Packing list: host, lanyard, charging cable