Overview: Install inside car steering wheel Built-in FM transmitter, support full frequency range (87.5-108.0 M Hz) Adopt 2.4G third generation CSR bluetooth version 2.0, & transmitting distance is more than 5 meters Built-in speaker 1.9' High resolution LCD screen display song, frequency, incoming phone number Key function:frequency switch/pause/play/volume/previous song/next song/answer/end/private answer Power Supply: battery or car lighter Battery: Rechargeable Li-ion (Replaceable, 1 BL-5B included) Packaging include :1 Steering wheel mount bluetooth handsfree 1 Car charger 1 User manual Specifications: Dimensions: 8.31 in x 2.64 in x 1.81 in Weight: 15.77