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Feature

DAC: Asahi Kasei AK 4375a 2 / Input: Bluetooth A2DP or USB DAC / USB DAC: USB Audio Class 1.0 (Up to 48 kHz / 16 bit)
Output: 3.5 mm (Unbalanced) / 2.5 mm (Balanced / 4-Pin) / Output Level: 3.2 Vpp (Unbalanced) / 6.4 Vpp (Blanced) / Output Impedance: 1 (Unbalanced / Blanced) / SNR: 109 dB (Unbalanced) / 110 dB (Blanced)
Bluetooth Version: 4.2 / Profile: HFP / HSP / A2DP / AVRCP / Corresponding Codec: aptX / aptX HD / AAC / SBC / Maximum Communication Distance: about 10 m
Battery Capacity: 350 mAh (Lithium Polymer) / Continuous Playing Time: about 14 hours / Body Size: (W) 30 (H) 53 (W) 15 mm / Body Weight: about 20 g
English Instruction Manual URL (PDF):http://radsone.com/radsone-home/miscellaneous/EarStudio_Manual_20170623.pdf#search=%27RADSONE+ES100+PDF%27