Signal stabilizer 15 meters barrier -free transmission signal stable, zero delay without stuttering, applicable car/office/entertainment and other household occasionsSupports TF card plug-and-play. Insert TF card for playback. Built-in smart decoder can directly play TF card music. Supports multiple formats (MP3/WAV)Upgrade devices without Bluetooth to a Bluetooth LED digital display Bluetooth adapterHigh-definition LED digital display with real-time status display and cold light that is not dazzling. Equipped with Bluetooth 5.3 chip for better sound quality and more powerful performanceBuilt-in 300 mAh lithium battery, continuous listening to songs, navigation and calls for about 8 hours. Four modes to meet your needs. One-touch switching between receiving/transmitting/FM/TF modesBluetooth transmit power: 7dBmOutput impedance: 32ΩFrequency response:20-20KhzSignal-to-noise ratio: 90dbMicrophone sensitivity:-42dbBluetooth receiving effective distance: ≥15MFM transmitting effective distance: ≥2MFM transmitting frequency: 87.5-108.0MHZTF card playback: supports automatic power-off memory function, supports up to 32GInput parameters: 5V/2.1ACharging time: about 2 hoursListening time: about 6 hoursBluetooth transmit (TX), Bluetooth receive (RX), TF card playbackBluetooth version 5.3VApplicability: computers, TVs, projectors (transmitting mode)/speakers, headphones, vehicles (receiving mode)AUX interfaceBuilt-in battery 300MAH, with protective plateColour:As ShownMaterial:ABSPackage Contents:1 x Bluetooth Transmitter ReceiverOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.