Ultrasonic Portable Keychain for Outdoor Use, Rechargeable Clip-On Rainproof Device with 7 Adjustable Frequency Settings, USB Cable for Camping, Hiking, Backyard, Travel, 1.0 × 1.1 × 0.6 in

["Portable Clip-On Design: Compact ultrasonic clip-on keychain measures 1.0 × 1.1 × 0.6 in (26×29×14 mm); attaches to a backpack, belt loop, stroller, tent, keychain, or outdoor gear","7 Frequency Settings: Adjustable frequency modes allow you to switch settings with one press; touch power switch makes the small keychain simple to operate during outdoor use","Rechargeable Battery: Built-in 3.7V 75 mAh battery provides 144+ hours of working time after full charge; charges in about 3 hours via USB cable","Rainproof Outdoor Use: Rainproof design supports use during camping, hiking, travel, backyard time, patio sitting, fishing, walking, and other outdoor activities","Easy Mode Control: Long press for 2 seconds to power on; press once to change frequency; purple light indicates sleep mode; long press until indicator flashes three times to power off"]