FiiO has released a line of Bluetooth amplifiers recently. It can be a bit confusing to to differentiate them based on model numbers. Below is a comparison chart of the FiiO lineup. The lightest and simplest model is the μBTR (or uBTR), it is an amplifier-only model with no DAC. The most feature-rich model is the BTR3, it supports the most wireless audio formats. The BTR1K is a replacement of the BTR1 model. This updated model features a new Qualcomm Bluetooth chip and USB Type C connection.

 

BTR3 BTR1 BTR1K μBTR
Supported Audio Formats SBC, AAC, aptX, aptX LL, aptX HD, LDAC, LHDC SBC, AAC, aptX, aptX Low Latency (LL) SBC, AAC, aptX, aptX Low Latency (LL) SBC, AAC, aptX
Profile HFP, HSP, A2DP, AVRCP
Bluetooth Chip CSR8675 CSRA64215 QCC 3005 CSR8645
DAC/Amp AK4376A AK4376A AK4376A TPA6132A2 Amp (No DAC)
USB DAC Yes No Yes No
NFC Yes No Yes Yes
USB Port Type C Micro USB Type C Type C
Battery Capacity 300 mAh 205 mAh 205 mAh 120mAh
Battery Life Approx 11 hours Approx 8 hours Approx 8 hours Approx 8-9 hours
Charge Time 1.5 hours 2 hours 1.5 hours 1 hour
Dimensions 2.3″ X 1″ X 0.4″ 2″ X 1″ X 0.5″ 2″ X 1″ X 0.5″ 2.2″ X 0.75″ X 0.4″
Weight 26 g 20.5 g 20.5 g 12.5 g