Ktx-1411 Wireless Bluetooth Portable Speaker 4 Inch - Elevate Audio Experience With A Portable And Wireless SpeakerFWIRELESS CONNECTIVITY • SUPPORT USB/TF CARD • RECHARGEABLE BATTERY • WIRELESS STEREO TWIN SPEAKER FUNCTION, WHEN YOU HAVE TWO DEVICES • NEED TO LONG-PRESS “M” TO BUILD • THE CONNECTION BETWEEN • FM RADIO, SEARCH RECORD • THE FM FREQUENCY IS AUTOMATICALLYWireless transmission range: up to 10 metersSpeaker drive size:4 inchOutput power:5WFrequency response:100Hz-20KHzSignal to noise ratio:>=85dBFM scan range: 87.5-108.0 MHzUSB Charging: DC 5VBattery capacity:500mAh