FM Transmitter, SainSonic Discovery D1, Bluetooth LCD Display on PLL, Support Pre-emphasis and TF Card Playback, UL Certified Adapter - Black Support Pre-emphasis - 50s /75s adjustable; Monostereo Adjustable - Optional in Mono/Stereo channel. Multiple Connection PortsVarious connecting methods are available including TF Card, USB and MIC with L/R audio input, making it widely compatiblewith different connecting devices in different occasions; High-fidelity and High Stability Adopted by transmitter chip BH1415 with built-in PLL frequency from Japan ROHM Company and Mitsubishi RD06 power amplifier chip,it achieveshigh-fidelity and high stabilityfor signal transmission; Excellent Performance It is equipped with50s /75s adjustableaudio pre-emphasis, limiter and low pass filter circuit and optional in Mono/Stereo channel, providing excellent and stunning stereo sound effect; Good Heat DissipationThe product crust is made of high-quality aluminumalloy, which also is the heating panel of power amplifier. The stability of the chassismakes sure the equipment works safely and continuously