JBL Junior JR470NC Bluetooth Noise Cancelling Over-Ear Headphones introduce a whole new generation to JBL Sound at volumes that are safe for their ears. They won’t go beyond 85dB, protecting young listeners from dangerous sound levels and feature Active Noise Cancelling, so a noisy environment won’t make kids want to crank up the volume. You can use the JBL Headphones app to customize their maximum volume and daily listening time and get daily or weekly reports on your child’s listening activity. Designed for kids, the 470NC headphones are comfortable to wear with durable oversized controls that are easy for even the littlest hands to use. Up to 50 hours of battery life means long-lasting fun and a built-in mic lets kids chat with family, friends or teachers easily. For a super-quick boost, five minutes of charge will give you another three hours of battery life. They include a JBL sticker set so your little rockstars can personalize their look. Great sound has no age limit. Specifications: Driver size: 32 mm/1.26-inch Dynamic Driver, Power supply: 5.0 V 1.0 A, Maximum operation temperature: 45 degree Celsius, Sensitivity: 83 dB SPL1 kHz, Frequency response: 20 Hz-20 kHz, Impedance: 35 ohm, Maximum SPL: 82 dB, Microphone sensitivity: -37 dBFS/Pa1 kHz, Bluetooth version: 5.3, Bluetooth profile: A2DP V1.4, AVRCP V1.6.2, HFP V1.8, Bluetooth transmitter frequency range: 2.4 GHz-2.4835 GHz, Bluetooth transmitter power: (EIRP), Bluetooth transmitter modulation: GFSK, π/4 DQPSK, 8DPSK, Supported formats: .MP3, .WAV, .WMA, .FLAC, Battery type: Lithium-ion battery (500 mAh/3.7 V), Charging time: 2 hrs from empty, Music playtime with BT on and ANC off: Up to 50 hrs, Music playtime with BT on and ANC on: Up to 28 hrs, Talk time with ANC off: Up to 29 hrs, Talk time with ANC on: Up to 20 hrs, JBL Headphone App: Yes.