Highlights Unique 2 In 1 Design 4 Music Playing Modes Crystal Clear Hands-free CallSpecification Dimensions:4.30 in * 4.84 in * 1.57 in Weight:0.2400 lb Available Ship to:United StatesDetails *Features*: **Unique 2 In 1 Design*:Combines car FM transmitter and wireless 4.2 Headset,and both of the can be used independently. The wireless headset offers you a safe,reliable and simple way to answer or make calls on the go,and the car FM transmitter comes with a charging dock which can easily houses the Earpiece inside. **4 Music Playing Modes*:With FM strong signal,it can play music from your wireless-enabled audio devices to car stereo system. It also support play music from TF card(up to 32GB),USB flash disk(up to 32GB). The aux-in makes it can stream music from MP3,MP4 and other audio devices with 3.5mm port. Easy to switch between TF card,wireless mode,USB disk mode with "Multifunction" button. **Crystal Clear Hands-free Call*:Stable wireless connection and CVC noise cancellation technology of microphone ensures crystal-clear calls. Note:Pick up the wireless headset from the charging dock to answer the incoming call automatically,and put back the wireless headset to transmit the call to car audio system. **Dual USB Port*:The USB port with charging icon for 5V/2.1A fast charging(charge your phone or other devices in fast speed),the other one with music icon is for reading U disk or 5V / 1A output charging. You can listen to music while charging you device at the same time. **Foldable and Convenient*:The flexible neck adopts 135° adjustable design for the optimal viewing angle and operation experience;Works well with most wireless-enabled devices. The screen will show FM frequency,wireless mode,TF or USB mode. **Two Charge Ways*: *The wireless earbud can be easily charged by the charging dock or via micro USB port. *Specifications*: Material: ABS plastic, aluminum alloy Rated Input: 12-24V Limited Working Voltage: 9-26V Working current: 45mA Standby current: 25mA Frequency: 2.402-2.408GHz Sensitivity: 92dBm Wireless Version: CSR 4.2 Protocol Supported: A2DP Wireless Transmission Distance: ≤10M/32feet USB Output: 5V/3.1A max FM Frequency Range: 87.5-108.0Mhz RF Output: 4dBm Mic Transmission Range: ≤2M/6.56 feet MMC Card Supported: ≤32GB USB Driver Supported: ≤32GB Headset battery: built-in 3.7V 100mAh lithium battery Runtime of headset: ≥6 hours Size: 3.46' x 1.38' x 4.13'/8.8 x 3.5 x 10.5cm (L x W x H) Weight: 50g/1.76oz (without headset) *Package Lists*: 1 x Wireless MP3 FM Transmitter Car Kit 1 x Wireless Headset 1 x Audio Cable 1 x Replacement Earcap 1 x User Manual