300kg or 50g Bluetooth-Compatible Crane Scale Rechargeable Portable Hanging Industrial Hook Scales Stainle Steel With 4.0 BT USB 50 percent OFF Optional Blue tooth 4.0 function Built-in 400 mAh lithium battery Three functions of charging, plug-in, and AAA battery, super loud buzzer prompt Super long range Full viewing angle LCD High-grade white LED backlight with purple background Bold stainle steel hook, waterproof mask, waterproof ring design at the handle connection High-strength ABS engineering plastic shell, thickened stainle steel environmentally friendly electroplating hardware Industrial-grade materials and workmanship, durable. Specification Shell material: ABS engineering plastic Body size: 7.6 x13.8x3.9cm LCD size: 52 x 23mm Hardware wire diameter: 10 mm Color box size: 17.5x16.7x5.2 cm Unit: kg, lb, vi (Fez) Version: Normal version, Blue tooth version (optional) Color: Black, Orange Range: 300kg or 50g (upper can weigh 300kg, division value 50g, lower can weigh 0.2kg, error 0.1-0.3kg) The functions are: switch, unit or lock, reset and tare, when weighing, the value can be selected manually or automatically, zero tracking, 120 seconds automatic shutdown, unlock function Package included Please scan the code to download the supporting APP (Android or Apple application market search Weiheng Smart APP download)