Features: 1. Built-in answering button, the wireless distance between the earphone and the neck ring is about 20 cm. 2. Suitable for Android phones, tablets, Kindle, e-readers, any portable device with standard 3.5mm jack, phone, MP3 player. 3. Small size, light weight, easy to conceal, bright and clear sound, long battery life. 4. Simple and safe to wear, clarity and high strength rope can help you easily remove the headphones from the ear canal. 5. Made of high quality materials, durable to use. Specification: Product model: DK06 Line length: about 1.6m/5.25ft Headphone jack: Approx. 3.5mm/0.14in Shape: Anatomical shape Receiver Type: Magnetic / Analog Maximum volume: 110dB Battery: sr416sw / 337 Battery life: 8 hours Package List: 1 * Headphone Cable 1 * Earphone 2 * Matching Battery How to use: 1. Open battery door, install the battery perfectly and push battery door into battery box gently. Put the earpiece into ear canal by holding the handle and the slight sound of current indicate working order. 2. Adjust the volume of drive equipment to reach satisfaction. 3. Set mobile phone to automatic return or vibration. 4. Put the inductive loop around your neck and connect the inductive loop to the drive equipments (mobile phone, radio) which are attached to or beneath users clothing. 5. One transmits message with radio, the other wearing an earpiece and inductive loop who also has a radio can hear the message very clear. Because the inductive loop inducts the message from the radio to earpiece and then earpiece transforms the electromagnetic inductive signal to audio signal to reach the wireless inception. Communication distances and radio power are the direct proportion. You can communicate with others freely once network exist when you use mobile phone. Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.1Built?in answering button, the wireless distance between the earphone and the neck ring is about 20 cm. 2Suitable for Android phones, tablets, Kindle, e?readers, any portable device with standard 3.5mm jack, phone, MP3 player. 3Small size, light weight, easy to conceal, bright and clear sound, long battery life. 4Simple and safe to wear, clarity and high strength rope can help you easily remove the headphones from the ear canal. 5Made of high quality materials, durable to use.