SUBSCRIPTION PLAN NEEDED - Monthly, 1 year, 2 year and 5 year plans available starting at $5 per month. Try risk free with a 30 day money back guarantee. NEW XL SIZE - Built for big (40 lbs and up) dogs and fits collar widths up to 1.6". Waterproof and adventure-proof for your outdoorsy friend. UP TO 21 DAYS OF BATTERY - Extended battery life up to 21 days depending on usage and network connectivity.