Features: brand new and high quality Full Patch Process. Wide Range of Operating Voltage . Power supply reverse for protection. Dual audio output terminal. External antenna (for mounting inside a metal box). LED indicator:Flashing: waiting for a connection.Slow flashing: audio playback .Steady on: connected. Specifications: Material:Metal Input Voltage: for DC 5V-35V Bluetooth-compatible Version: 4.2 Working Temperature: -40 C to 85 C Peripheral Size: 55x32x9mm/2.17x1.26x0.35in, Note: Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1x Bluetooth-compatible Decoding Board