Soundance Bluetooth Speakers with Sub-woofer Effect &Tweeter Speaker, FM Radio, Alarm clock, Built-in Mic, Support 3.5 mm Audio Jack, Micro SD Card & USB Input, SDY021(black-red) New Bluetooth v3.0 Technology allows you to Connect wirelessly up to 35 feet away. . Easy to pair - No code/pin needed. Premium Sound with built-in 66mm subwoofer speaker and 40mm tweeter speaker to provide frequency response from 80Hz to 20KHz. Signal to Noise Ratio(SNR) is greater than 95dB and distortion (THD) is less than 0.3%. Professional hardware deliver crisp clean sound with super deep bass effect. Built-in Rechargeable Battery for up to 8 hours of playtime. Built-in microphone for hands-free speaker phone calling LED display with FM Radio and clock and alam function. Support Micro SD Card and TF card insert and play. 3.5mm audio line in and USB input acceptable. Support MP3, WMA, WAV, APE and FLAC format.