Support FM channels Support Bluetooth hands-free phone calling via built-in microphone Support for iPhone SIRI, just long press MFB button for 2 seconds to activate the function, more convenient to use Built-in tow USB ports, one USB port supports Qualcomm QC3.0 standard, the other one is 2.4A Support TF card music reading, can play music files on MP3/WMA format (TF card is not included) Built-in 3.5mm line in / out jack, support to wired connect to external devices such as car stereo, speaker, etc. 1.65 inch large LCD display, can show the FM frequency and connected device& 39;s name, it will also show the song& 39;s name and play time when it is in TF card mode Support sleep function. The FM function and Bluetooth function can be turned off while the USB charging function still can work Support voltmeter function. The screen will display the car battery voltage when it is turning on Flexible metal hose, the monitor is 360 degrees rotatable, fit for most cigarette lighter socket with different location on different cars DC 12-24V voltage input, applicable to most cars, trucks, off-road, etc. Specification: Material: ABS Bluetooth Version: Bluetooth V4.2 + EDR Bluetooth Music Processing: A2DP, AVRCP, HFP Frequency: 2.402-2.480GHz Files Supported: MP3 / WMA / WAV FM Frequency Range: 87.5-108MHz Bluetooth Effective Distance: Max. 5m / 16.5ft FM Effective Distance: Max. 2m / 6.6ft Sensitivity: -42dB+/- 3dB Working Voltage: DC 12-24V USB Output: 5V / 2.4A QC3.0 USB: DC3.5-6.5V / 3A, DC6.5-9V / 2A, DC9-12V / 1.5A TF Card Capacity Supported: Class 10, Max up to 32G (not included) Port: 2xUSB 2.0, 1xTF card slot, 1xAUX in / out jack Work Temp.: 0~50 Centigrade Certification: CE, RoHS Hose Length: 7.1cm / 2.8" Charger Size: 3x4x9cm / 1.2x1.6x3.5" (LxWxH) Monitor Size: 7.8x5.6x3.4cm / 3.1x2.2x1.3" (LxWxH) Package included: 1 x BT70 FM Transmitter Dual USB Car Charger 1 x 3.5mm Audio Cable 1 x English User Manual Other things not included