Green Lion X Neckband Earphone offers excellent sound quality and is highly convenient to listen to when exercise , walking or outside. Made with ABS-Silicone material, it has Bluetooth V5.3 for seamless connectivity and can work up to 30 hours on a single charge with a 200mAh battery. The 10 mm speaker of the earphone gives away a strong audio quality with 3mW power output and -90 dB sensitivity. The earphone has a Type-C charging port for fast charging within 2 hours and a 10 m transmission range. In addition to an LED flashlight and TF card function, it performs various functions, making it a handy accessory in any lifestyle. Specification ?Material: ABS-Silicone Bluetooth: V5.3 Battery: 200mAh Voltage: 3.4V Speaker: 10 mm Power: 3mW Impedance: 16? Sensitivity: -90 dB Transmission Range: 10 Mtr Charging Port: Type-C Charging Time: 2 Hrs Playtime: 25-30 Hrs Features 30H Play Time LED Flashlight TF Card Function