Specifications:
- Class IIIa laser diode module
- 650nm (red) dot output
- 6mm diameter (0.235") x 13.9mm (0.55") overall length
- Dot spread at 15M distance measures 10-15mm diameter
- 5VDC maximum input
- -36 ~ 65°C operating temperature range
- Prewired with 75mm (3") wire
- 1.4g
Although these are coarse lasers, they still should be operated using standard laser-safety operation rules. Check out the Wikipedia page for information (and drop a donation on them. We do from time to time.)