Description: This item supports play format: MP3, WMA, WAV, FLAC. Can use phone charger, mobile power or PC USB port for charging, convenient to use. Aluminum shell, durable. Compact and portable size, easy to carry, light weight. 3.5mm audio preamp output, post-amp audio input, can also directly drive headphones. With a remote control, easy to adjust playback volume or other functions. Specification: Condition: 100% Brand New Shell Material: Aluminum anode black + plastic frame Type: (optional) #1: With Power Isolation #2: Without Power Isolation Power supply: DC 5V Audio Output: 3.5mm audio preamp output Audio Input: 1. Bluetooth receive 2. USB decoding 3. card decoding play 4. 3.5mm headphone audio input Product Size: Bluetooth Audio Receiver Box: Approx. 55 * 52 * 22mm / 2.2 * 2.0 * 0.9inch Remote Control: Approx. 86 * 40mm / 3.4 * 1.6inch Product Weight: Approx. 66g Package Included: 1 x Bluetooth Audio Receiver Box 1 x Remote Control Note: With internal power supply isolation, it avoids the problems of noise generated by the quality of the user's power supply between the receiver box and post-amp ground currents, more suitable for the use of car modification.