This is a Bryton cycle computer. I am selling my S810. I have confirmed that it starts up. Although it's a more affordable version of the S800, it has a long battery life and sufficient performance. Please check the website for detailed specifications. I've used it for about a year and a half, so it has some wear and tear, but nothing that affects its functionality. I will include a charging cable and mounts (3 mounts, including one that is completely unused). I will reset it to factory settings before shipping. This is a used item, so please understand that it is non-refundable and non-returnable.