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AN/PRQ-7 Combat Survivor/Evader Locator (CSEL) combines selective availability GPS, UHF line of sight and UHF satellite communications along with a Sarsat beacon. It can send predefined messages digitally along with the user's location.[16][17] As of 2008, the PRQ-7 cost $7000 each, "batteries not included." A rechargeable lithium-ion battery pack cost $1600, while a non-rechargeable lithium-manganese dioxide unit cost $1520.[18] As of Oct, 2011 Boeing has delivered 50,000 PRQ-7s