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Specification: Operating Frequency: 2.4G technology Structure Fixed way: Fastening buckle bit Case Material: ABS Modulation: GFSK Power Supply: 1* AAA Battery (Package not include) Operating Current: 5mA (MAX) Sleep Current: 0.5mA Effective Distance: Approximately 32.8FT (10M) Accessibility Working Temperature and Humidity: 5-50 celsius 10%-85%RH 25celsius Storage Temperature and Humidity: -20-70 celsius 5%~95% 25 celsius Package contents: 1 x 2.4G Wireless Numeric Keypad 1 x Wireless USB Receiver 1 x User Manual