Specificatoins:1.Color: Black2.Size: 8.5x 4.5x 4cm3.Model: BT204.Material: ABS(Acrylonitrile Butadiene Styrene)5.Baluetooth version: AC4601 V2.16.Bluetooth Protocol: AVRCP、 HFP、 A2DP7.Frequency Range: 87.6-107.9MHZ8.Frequency stability: ±10ppml9.Product lnput: 12-24V10.Music Format : MP3、wma11.Micro SD Card(Max capacity): 32G12.USB Disk(Max capacity): 32G13.Product Total Output: 5V\/3.4A14.Loop mode: Normal、 Single cycle、 Repeat all、 Random15.EQ: Classical、 JAZZ、 POP、 ROCK、 Vocal etc.Features:1.Wirelessly transmit phone call from Bluetooth mobile phone to the car FM stereo system.2.Switch to Hands-free mode automatically from music playing status when receiving calls.3 .Built-in Microphone4. Dual usb Outputs 5v\/3.4A totally、 charges ipod iphone ipad and other devices5. support usb disk \/Micro SDcard6. Strong and elegant design with led frequency display7. With remote control8. With voice promptsPackage Included:1x Bluetooth device1x User guide(The others are not included.)Note:1.Moist or underwater conditons.2.Conditions near heater or high-temperature service.3.Conditions with direct and strong sunshine.4.Comditions with apt falling.