Feature: 1. Classic appearance design, more high-end. 2. Using Bluetooth-compatible version 4.2, which has better using effects. 3. The Bluetooth-compatible speaker, which is easy to operate and can be instantaneously communicated with ordinary speakers, is more suitable for car systems. 4. Extra long receiving distance, open and unimpeded area can reach more than 15 meters. 5. Ultra-clear call effect, smooth and unimpeded voice chat. 6. Built-in batteries, which can be recharged and used repeatedly, with long battery working time. 7. Supports all digital products with Bluetooth-compatible functions, such as mobile phones, computers, for iPhones, for iPads, MIDs, etc. Specification: Product model: BT-13 Bluetooth-compatible Version: 4.2 Packaging Method: Color Box Packaging Built-in battery: 300 mAh capacity (about 8 hours) Packaging size: 104mm*102mm*41mm/4.09*4.01*1.61'' Product size: 75mm*75mm*13mm/2.95*2.95*0.51'' Product weight: 125 g Power supply mode: built-in battery power supply, micro USB power supply Output interface: 3.5mm headphone interface Note: Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not show the actual color of the item. Thanks for your understanding. Included: 1 X Bluetooth-compatible Receiver Transmitter 1 X USB Cable 1 X 3.5mm to 2RCA Audio Cable 1 X 3.5mm Audio Cable 1 X User Manual 1. Classic appearance design, more high-end. 2. Using Bluetooth-compatible version 4.2, which has better using effects. 3. The Bluetooth-compatible speaker, which is easy to operate and can be instantaneously communicated with ordinary speakers, is more suitable for car systems. 4. Extra long receiving distance, open and unimpeded area can reach more than 15 meters. 5. Ultra-clear call effect, smooth and unimpeded voice chat.