Note: The product is shipped without the 18650 Battery.

Main hardware updates for the Mayhem Signature-Edition PortaPack H4M Pro：

1. The main change is the modification of the connector of the lithium battery, from the previous 104050 polymer lithium-ion battery (also known as soft pack lithium polymer battery) to 18650 cylindrical lithium battery.
2. With the help of the Mayhem team, the silkscreen of the product has been redesigned, and an anti-counterfeiting pattern has been added to the front PCB (we will record a video specifically to introduce to users how to distinguish the authenticity of the product). In addition, PortaPack H4M Pro has addedmore Mayhem firmware developer names to the back PCB.
3. Redesigned the position of the speaker and SD card slot.

   Main hardware updates for the HackRF Pro：
   

   Hardware Item	HackRF One	HackRF Pro
   Main MCU	LPC4320	LPC4330
   Logic Chip	CoolRunner-II CPLD	iCE40 UltraPlus FPGA
   Flash Memory	8M-bit (W25Q80BV)	32M-bit (W25Q32)
   RF Transceiver Chip	MAX2837 / MAX2839	MAX2831
   ADC/DAC Chip	MAX5864	MAX5865
   Working Frequency Range	1 MHz ~ 6 GHz	100 kHz ~ 6 GHz
   Onboard Clock	No built-in TCXO	Built-in 25MHz 0.5ppm high-stability TCXO
   USB Interface	Micro-B USB 2.0	USB-C USB 2.0
   RF Shielding	Basic simple shielding	Reinforced internal RF shielding
   Port Protection	Standard design	Enhanced antenna port surge protection
   Firmware Expandability	Limited	Stronger expandability for custom firmware

   Typical development work done by OpenSourceSDRLab to adapt the Mayhem firmware for HackRF Pro:
   

   1. Compatible with HackRF ProH4M touch control.
   2. Enter into HackRF Pro mode.
   3. Fix audio mode switchbug, add a short sleep, eliminatingred box issue.

   All of the above code has been submitted to the Mayhem repository and merged into the code branch of HackRF Pro. OpenSourceSDRLab will continue to actively participate in Mayhem's firmware development work and continuously improve the hardware.