ER3045B Features Support Bluetooth hands-free telephone， convenient and safe on the phone  Have CVC noise processing， has the wind noise suppression function， full-duplex call technology   High quality A2DP streaming  Support USB/SD card MP3 format music playing  PLAY music， long press PLAY button transmitter 4 seconds can realize not code replay function   With multi-function remote control， can realize number song selection and choose frequency  General Specs Bluetooth Version V2.1+EDR Rated Voltage 12 Power Consumption 1W Work Temperature -20-50 degrees SNR >60dB Bluetooth Transmission Distance 10-15m Frequency of Transmission 87.5-108MHz Frequency Response 20Hz-15KHz Package Details Weight: 88.81 g Size: 18*8*5.4 cm