Features: A Bluetooth-compatible device that receives and transmits two in one, which is simple in operation and capable of freely transmitting and receiving all audio signals. It also supports online gaming, television, and movie sound transmission in real for time. More convenient is through the product Bluetooth-compatible transmission mode, can make TV, CD- player, MP3 or other audio source sent to the Bluetooth-compatible speaker or Bluetooth-compatible headset As the product uses low-latency technology. The receiver is connected to ordinary 3.5mm headphones, ordinary speakers, car speakers, headphones. Through the product Bluetooth-compatible reception mode, the music in the mobile phone can be transmitted to the traditional home speaker equipment. Specifications: Battery: 200mAh built-in Li-ion battery Power voltage: 3.7V Charging time: 2 hours Working time: 10 hours Frequency: 2.402 - 2.480GHz Material: ABS Color: black Channel: Stereo Interface type: 3.5mm interface Bluetooth-compatible version: Bluetooth-compatible 4.2 Size: approx. 6.2x4x0.8cm/2.44x1.57x0.31in Note: No retail package. 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. Package includes: 1PC x 3.5mm Bluetooth-compatible Transmitter Receiver 1PC x Audio Cable