Features: It adopts 5.0 Bluetooth DC3.7V-5V power supply, and undergoes secondary development processing through peripheral hardware. The maximum power can be configured to reach 10W (5W*2). Can be modified for external power amplifier (from the 3P block OUT audio output external). Micro wave power switch control. Hands-free calling and external buttons. USB is the charging input (the lithium battery can be charged from here when it is plugged into the red power socket; the red light is on when charging; the red light is not lit when the battery is fully charged). Specification: Material: PCB Bluetooth: 5.0 Current: 1.5A-2A PCBA size: approx. 40 * 34 * 9cm / 15.75 * 13.39 * 3.54in (including terminal) Package Weight: approx. 40 g Package list: 1 * Power Amplifier Board 1 * Cable Selection Criteria: Speaker requirements: 2. 3P socket OUT audio output: If you need to connect other power amplifiers can be connected from here (intermediate audio ground, left and right are L and R respectively. Bluetooth connection: The mobile phone starts Bluetooth detection from the setup menu, so that the mobile phone is detected by the device, and then goes to the Bluetooth menu - search for the device or the paired device. After searching (YMX-868BT) "Touch Pairing", it also hears "Connected successfully or prompts" to complete the pairing; Note: It is not the smartphone (Android system) to enter the password -0000; the product Bluetooth device name YMX-868BT. Pay Attention: 1) Red 2P seat BAT is connected to the power supply positive DC 3.7V to 5V+, GND is connected to the negative pole; white 2P seat is connected from the bottom to the upper L-O-/L-O+, and the white 2P is R-O-/R-O+. 3) Audio output: 3P block OUT audio output can be modified for external power amplifier, the middle is audio ground, left and right are L and R respectively..