A must have tool when travelling or for use in water supply emergencies, the Steri Pen Sidewinder has a dynamo function so that there's no need for batteries or a mains power supply. Germicidal UV light has been proven to destroy waterborne bacteria, protozoa & viruses present in contaminated water so whenever you may be in doubt about the purity of water you can use the Steri Pen Sidewinder to destroy any contaminants easily & efficiently. Follow the simple instructions in the user guide on how to achieve the best results. By carrying the Sidewinder UV water purification system with you when travelling to remote places where water purity maybe an issue, whilst camping, trekking or even music festivals, you can protect both yourself & your family from illness. Both easy & quick to use, the Sidewinder can purify 1L of water in just 90 seconds & the UV light can purify over 8, 000L of water before it needs to be changed. Handheld UV water purifier with sidewinder dynamo mechanism Proven effective to kill 99.9% of all bacteria Easy to use Fast purification – 0.5L in 48 seconds, 1L in 90 seconds Measures 21.8cm x 14cm x 9.7cm Weighs 470g Battery free – ready to use straight away UV lamp life – 8, 000 treatments Instructions included