<p>Main control chip: ESP32-WROOM-32U, Flash 4MB, Wi-Fi + Bluetooth dual-core module</p> <p>Display technology: 2.8-inch 320x240 resolution, IPS full-view LCD screen, with resistive touch</p> <p>Control method: default numeric keyboard input and knob tuning method, also supports touch screen firmware</p> <p>Antenna interface: full-band external antenna, standard SMA male screw female connector.</p> <p>Speaker output: TI audio amplifier chip TPA6211A1 is used to drive 82x43mm dual-diaphragm large sound cavity speaker, power 4\u03A9\/3W, lower output noise and less distortion.</p> <p>Headphone output: AD headphone amplifier chip MAX97220 is used, standard 3.5mm audio connector output, dual amplifier design for speakers and headphones, optimized separately without affecting each other.</p> <p>Battery parameters: 3.7V\/5000mAh, 18.5Wh</p> <p>Current consumption: about 3.7V\/350mA, use time is about 15 hours.</p> <p>Communication interface: built-in CH340 USB to serial port chip, external communication through TYPE-C interface</p> <p>Note: The antenna is not included in the shipment.</p> <p>Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use.</p> <p>colour: White</p> <p>material: PCB</p> <p>Package Contents:</p> <p>1 * Radio</p> <p>1 * Touch pen</p> <p>1 * TYPE-C data cable</p> <p>Only the above package content, other products are not included.</p> <p>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.</p>