Marco Polo Drone/UAV/Model Rocket Location and Recovery System &ndash; No GPS or Cell Service Required &ndash; No Monthly Fees &ndash; Never Lose your Drone Again - Starter System for 2 Aircraft Simple to setup and use, single button-push to begin searching for lost RC model with real-time distance and direction feedback Works anywhere, totally self-contained, no GPS or cell network required, no monthly service contracts, ideal for remote areas Rechargeable lithium-ion battery in transceiver tag gives you up to 15 days to find your lost model Super small, compact tag transceiver easily fits on even small RC models, weighs only .42 oz. (12 g) Does not interfere with RC radios  Marco Polo only transmits when you activate search mode from the handheld locator