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FiiO BTR3K Hi-Res Bluetooth 5.0 Receiver/Headphone Ampis equipped with 2 high-performance AK4377A DACs, independent 22.5792M/24.576 MHz dual crystal oscillators, and balanced outputs for pure actual sound reproduction. Its CSR8675 chip supports Bluetooth 5.0 and LDAC/aptX HD lossless codecs. This amp offers strong decoding performance and enhanced audio signal measurements. You can quickly identify the Bluetooth format playing thanks to the RGB light indicator. BTR3K's aluminum-alloy body is wrapped with an oleophobic coating to keep off fingerprints.TECHNICAL SPECS:Chips Used: 2 x AK4377A DAC, CSR867 BluetoothDrive Ability: 16-100 OhmAudio Input: Bluetooth 5.0Wireless Transmission Range: Approx. 10m (OPEN LINE OF SIGHT)Supported Bluetooth Profile: A2DP, AVRCP, HFP, HSPSupported Audio Formats: AAC/SBC/aptX/aptX LL/aptX HD/LDACUSB DAC Sample Rate: 48kHz/16bitFreq. Response: 20Hz-20kHz aptX Connection, 20Hz-40kHz LDAC ConnectionChannel Balance: 0.1dB or Less ThanInline Controls: CTIA Mic and Inline Remote ControlBuilt-In Mic Function: Omnidirectional Microphone Supports Bluetooth CallVolume Adjustment: 32 Steps Independent AdjustmentConnectors: 3.5mm Headphones, 2.5mm Balanced Headphones, USB-CPower Source: 330mAh BatterySize: 2.28 x 0.98 x 0.43"Weight: 0.05 lbAccessories: USB Charging Cable; Lanyard; Removable Rear ClipAlso Comes With:Blucoil 5000mAh Portable Power BankThe travel-friendly Blucoil Portable Power Bank is equipped with Grade-A 5000mAh Li-Polymer Battery and 12" charging cable. It features a micro-USB port that supplies 5V, 2.0A, and two USB ports that provide 5V, 2.1A power for your smartphone, tablets, music players, wireless headphones, or USB devices. A full charging can take up to 3.5 hours. Conveniently recharge two devices at the same time.