The battery may be fully drained. Plug it into a power bank or USB-C charger for 10 minutes, then try again. If using AA batteries, check they are fresh and inserted correctly.
While there is no widely known consumer brand named "Renaetom," this term likely refers to Handheld Ticket Terminals Portable Bus Ticketing Machines used for mobile ticket issuance and validation. Alibaba.com renaetom ticket show portable
While rugged, using the included industrial-grade hand strap prevents fatigue and accidental drops. The battery may be fully drained