Specification Input power:10~16V DC(Free Voltage) Normal Current: > 50mA Maximum Current: >500mA Fuse:250V/2A Indicator:1 LED(2 Tone Color Lights) Speaker: Max.2W (8ohm) Microphone: Directional microphone -52dB Noise Cancellation: Up to 12dB Echo Cancellation: Up to 40dB Operating temperature range: -30C~+85C Full duplex operation with noise cancellation Bluetooth specification: V1.2 compliant Supported Profiles: Handsfree Profile, Headset Profile Power Class:2dBm Max (Class 2) Carrier Frequency:2400MHz~2483.5MHz Built in Flash memory:8Mbit Compatibility: This unit is compatible with most Bluetooth equipped cellular phones including Motorola, Sony Ericsson and Nokia, Samsung, LG, Etc. Features Digital noise cancellation system 12 Digit Caller ID (phone with handsfree profile required) Voice Announcing for Incoming Call Number Automatic Re-connection Simple operation Superior sound quality Loudspeaker mute button Full two ways (Duplex) conversation Easy set up Integrated buttons for answering/ending calls and adjusting volume