| frequency | 40KHz |
| Oscillator circuit | 640KHz crystal time base & divided by 16 |
| Operating temperature | 0~50 °C ( 32~122 °F ). |
| Operating humidity | Up to 80% RH. |
| Power | 2 AA batteries |
| Weight | About 50g/0.11lb (including battery) |
| size | 100x35x23mm (3.9x1.4x0.9inch) |
Warranty days: 730 days
1. For product quality problems caused by non-human products of instruments and equipment, the manufacturer will provide free warranty services during the warranty period;
2. There is no warranty period for fragile and consumable parts, and if you find product quality problems after receiving the goods, please apply for return and exchange within 7 days, and you will not wait for the overdue ones;