Signal Stabilizer – 15-Meter Barrier-Free Transmission with Stable Signal, Zero Delay, and No Stuttering. Suitable for Cars, Offices, Entertainment, and Other Household Use. Supports TF Card Plug-and-Play: Insert TF Card for Playback. Built-in Smart Decoder Plays TF Card Music Directly. Supports MP3 and WAV Formats. Upgrades Non-Bluetooth Devices to Bluetooth via LED Digital Display Bluetooth Adapter. High-Definition LED Digital Display Shows Real-Time Status with Eye-Friendly Cold Light. Equipped with Bluetooth 5.3 Chip for Enhanced Sound Quality and Performance. Built-in 300 mAh Rechargeable Lithium Battery Provides Up to 8 Hours of Continuous Use for Music, Navigation, and Calls. Four Operating Modes: Receive, Transmit, FM Broadcast, and TF Card Playback — Switched Easily with One Touch. Bluetooth Transmit Power: 7 dBm. Output Impedance: 32 Ω. Frequency Response: 20 Hz – 20 kHz. Signal-to-Noise Ratio: 90 dB. Microphone Sensitivity: -42 dB. Bluetooth Reception Range: ≥15 Meters. FM Transmission Range: ≥2 Meters. FM Transmission Frequency: 87.5–108.0 MHz. TF Card Playback Supports Auto Power-Off Memory Function; Compatible with Cards up to 32 GB. Input: 5 V / 2.1 A. Charging Time: Approx. 2 Hours. Listening Time: Approx. 6 Hours. Functions: Bluetooth Transmit (TX), Bluetooth Receive (RX), TF Card Playback. Bluetooth Version: 5.3. Compatible With: Computers, Projectors (in Transmit Mode); Speakers, Headphones, Vehicles (in Receive Mode). Includes 3.5 mm AUX Interface. Built-in 300 mAh Battery with Protection Circuit. Color: As Shown. Material: ABS. Package Includes: 1 × Bluetooth Transmitter/Receiver. Note: Colors May Vary Slightly Due to Monitor Settings and Lighting Conditions. Measurement Tolerance: ±1–3 cm.