Card-Free Design: No need for a SIM card or data card, making this intercom cost-effective and ready for use, providing children with a sense of freedom Convenient Back Clip: The wide back clip easily attaches to clothes, allowing the walkie-talkie to be securely worn on the waist or chest Interactive Fun for Kids: A cute toy that facilitates wireless communication, supporting clear parent-child interactions even through walls Long-Distance Communication: Provides clear intercom coverage up to 500 meters, thanks to strong signal penetration and high sensitivity Soft and Clear Sound: Delivers high-quality audio that is gentle on the ears, ensuring clear remote communication Specifications: Body Size: 92*61*40mm Intercom Distance: 500M (depending on the surrounding environment) Frequency: 462.56250MHz (USA) Channel Number (Simplex): 1 Frequency Stability: +2.5ppm RF Output: ＜10mW Operating Voltage: 3.7V Battery Capacity: 400mAh x 2 Charging Input: 5V/1A Charging Time: 1 hour Usage Time: 3 hours Battery Type: Built-in Lithium Battery Charging Port: Supports Type-C Weight: 59.5g/Pc Set Weight (2 Walkie-Talkies): 119g