Brand: Avantree. MPN: OPERA. Product Specifications: for transmitter: Bluetooth version: V5.0 Bluetooth profiles: HSP v1.2 HFP v1.7 AVRCP v1.0 A2DP v1.3.1 Audio codec support: aptX-LL aptX FastStream SBC Operating range: Class 1 up to 164ft/50m for headphones (AS90C): Bluetooth version: V5.0 Bluetooth profiles: HSP v1.2 HFP v1.6 A2DP v1.4 AVRCP v1.2 Audio codec support: FastStream SBC Operating time: up to 35 hours play time.