Basic Parameters: Main Control Chip: ESP32-WROOM-32U, Flash 4MB, Wi-Fi + Bluetooth Dual-core Module Display Technology: 2.8-inch 320x240 resolution, IPS full-view LCD screen, with resistive touch Control Mode: Default numeric keyboard input and knob tuning mode, also supports touch screen firmware Antenna Interface: Full-band external antenna, standard SMA male screw female connector Speaker Output: Adopts T audio amplifier chip TPA6211A1, drives 45x45mm large-size sound cavity speaker, power 40/3W, lower output noise, less distortion. Headphone Output: Adopts AD headphone amplifier chip MAX97220, standard 3.5mm audio connector output, dual amplifier design for speakers and headphones, optimized separately without affecting each other. Battery parameters: 3.7V/5000mAh, 18.5Wh, lithium battery size 65x55x10mm Current consumption: about 3.7V/350mA, use time about 15 hours Communication interface: built-in CH340 USB to serial port chip, external communication through TYPE-C interface Dimensions and weight: length 142 x width 30 x height 80mm (excluding antenna connector and antenna), body weight 300g Color: Red Material: PC The words on the product due to different product batches, but it not affect the use Package Contents: 1 x TEF6686 Radio Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.