Description: 100% brand new and high quality Feature: It is a upgraded receive/transmit two-in-one stereo Bluetooth-compatible adapter with optical fiber. Supports APT-X, APT-X Low Latency, AAC, SBC, High Definition. Can be used with Bluetooth-compatible speakers or headphones that support the A2DP protocol to form a wireless audio transmission net-work, which is used in TVs, CDs, home theaters and other devices. Can also be connected to mobile phones/computers to play music. Support optical input, optical output, AUX input, AUX output. You can switch the mode by turning the switch and the M button. You can switch TX / RX, fiber, and any mode arbitrarily. There are two interfaces of AUX input and AUX output, the stereo is more obvious. AUX: audio interface; SPDIF: optical fiber interface. Supports 2in1 functions: two stereo Bluetooth-compatible speakers or stereo Bluetooth-compatible headphones can be connected at the same time in TX state, and two speakers/headphones can emit sound at the same time; two phones can be connected at the same time in RX state. Which phone is the first to sound is currently the sound of which phone. Perfect for TV/Box/PS4 and other devices. Specifications: Item Type: Bluetooth-compatible Adapter Material: ABS Size: 54x54x15mm/2.1x2.1x0.5in Color: Black Bluetooth-compatible version: 5.0 Bluetooth-compatible chip: CSR 8675 Bluetooth-compatible range: more than 20 meters Bluetooth-compatible protocol: A2DP, AVRCP Bluetooth-compatible frequency: 2.402-2.480GHz Output: optical input, optical output, AUX input, AUX output Charging interface: 5V DC, 500mA Battery capacity: 400mah lithium-ion polymer rechargeable battery Delay: less than 40 milliseconds (ms) Quantity: 1 Pc Note: Transition: 1cm=10mm=0.39inch 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: 1 x Bluetooth-compatible Adapter 1 x Optical Audio Data Cable 1 x 3.5mm AUX Cable 1 x RCA Adapter Cable 1 x Micro USB Charging Cable 1 x User Manual