Supports hands-free calling with a built-in microphone for convenient and secure phone answering. Features CVC noise cancellation and wind noise suppression for clear calls, plus full-duplex call technology. Plays high-quality audio from your mobile phone when connected via Bluetooth. Automatically reconnects to the last paired device upon power-on and enters pairing mode when needed. Supports TF card expansion (up to 32GB, Class 6 or higher) for MP3/WAV music playback. Includes a car charger with 5V / 1000mA output to charge compatible devices. Specifications: Bluetooth Version: 2.1 + EDR Audio Frequency Response: 20 Hz – 20 kHz Microphone Sensitivity: 42 dB ± 3 dB Operating Voltage: 5 V ± 0.5 V Operating Current: 45 mA Standby Current: 25 mA Bluetooth Operating Frequency: 2.402 – 2.480 GHz Effective Bluetooth Range: Up to 5 meters RF Sensitivity: -92 dBm RF Output Power: 4 dBm FM Transmission Frequency: 87.5 – 108.0 MHz FM Transmission Power: 87 dBµV / 107 dBµV Effective FM Range: Up to 2 meters Package Includes: 1 x Car FM Transmitter 1 x User Manual Note: Slight measurement variations (0.5–1 inch) may occur due to manual measurement. Color appearance may vary slightly depending on monitor settings and lighting conditions. Customer satisfaction is our top priority.