Features: brand new and high quality The Newest Bluetooth-compatible 5.1 Version: Compliant to version 5.1 , backwards compatible to 4.2/4.1/4.0/3.0/2.0/1.0. With Microphone: Handsfree call when you are cleaning driving in RX mode. Universal Compatibility: This Bluetooth-compatible 5.1 Receiver can be connected to any A/V receivers and any powered speakers with standard 3.5mm jack or 2RCA ports, for ideal compatible for home theaters, stereo systems, and car stereos, also suitable for Smart Phones, and Android devices. Stream Music in 2 Speakers Simutaneously:With both 3.5mm and 2RCA connection options, you can enjoy music Wirelessly on 2 speakers simulteneously. Support 2 audio port to connect:Come With both 3.5mm and 2RCA audio port, Suitable for more devices (3.5mm cable and 2RCA cable included). Long-Range Wireless Connection: The wireless Bluetooth-compatible adapter supports the connection up to 10 meters/33 feet, controlling the music playing in a long distance. Specifications: Bluetooth-compatible version: V5.1 Supported protocols: RX: A2DP, AVRCP, HFP TX: A2DP Working frequency band: 2.402GHz-2.480GHz Power level: Class 2 (Class II) Audio codec: SBC Working current: RX7H Built-in battery: 250MAH Charging current: about 200MA Charging time: about 2 hours Battery life: RX>12H, TX>7 hours Bluetooth-compatible distance: >10M (open space) Charging method: USB Type-c 5V/0.5A Size: 6.3x6.3x2.3cm/2.48x2.48x0.91in Input/output connection: AUX, RCA audio interface Compatible: Android, IOS system mobile phones and PAD, and Bluetooth-compatible speakers or headphones that support the A2DP protocol are connected for use Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1x Bluetooth-compatible receiver transmitter