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Technique parameter 1.Frequency band:910A (UHF band),910B(ISM band short antenna)band fixed frequency point,using soft antenna to rod antenna to receive. 2.Transmission distance:2000m(max 5000m)in widen area,which is according to its using conditions. 3.Power supply:the transceivers use high energy Lithium batteries witch can be used for 36 hours to monitos and 16 hours to transmit in total. 4.Sensitivty (all directions )of sound picking up is better than 12db .Differentiate rate is high within 100 square meters .Impedance of audio input circuitry is low. 5.The jack (3.5mm) of the monitor head can be input all kinds of audio signals,such as monitoring audio frequency and MP3 output,and so on. 6.The input signal cab ve regulated for a loud and discortionless sound ,it can use the MP3 as a signal source to test which the provided connecting wire. 7.You can insert a three-way plug to the earphone hole ,thus ,you can connect the sound pickup to the recorder to record the content you heard at the same time as you hearing. attention: * Usedtoautomaticallypoweroffafter thecharge togreencontinuedstorage ofadditionalpowercanchargethe maximuml-hourand extendedbattery life.External powercharger foruse must beinfullchargestate (when thegreen lightoff) for, ifyouhuminterferencefrom thepullreceiverwill reduceor disappear.Pleasedo not uselongenoughto addelectricpowerto save andonceevery two months.Non-covered boxorKaicould damage the product.Transceivermust be matchedwith(packagemay be differentbetween thetransceiverfrequency). Learn More

Original New Watch battery 337 SR416SW Silver 1.55V button cell battery for swatch watch LED Headphone Learn More

Included FREE gifts: What`s in the package? 100% Brand New Earpiece Kit 12 months warranty! 1x Earpiece 808 1x Bluetooth Loop set 1x Battery - 337 SR416SW 1x Charger for Bluetooth Loop set other Spy Device Learn More

2017 Model GSM Neckloop Credit Card Earpiece Spy Bluetooth Kit SIM Covert Student Cheat Copy Exam Test ID Box Loop Surveillance Security Micro Invisible Loopset Hidden Mobile Portable Gadget Set Learn More

Package Contents: 1 x Bluetooth Watcg 1 x A218 Earpiece 1 x AC Adapter (100~240V, 50/60Hz, 5V/200mA) 1 x Batteries Without Retail Box Learn More

• Mini wireless earpiece consists of specialized chip, shell, faceplate, battery door, handle etc.
  1.Battery door: Open battery door by fingertip, install the battery perfectly and push the battery door to battery box.
  2.Handle: Clarity and high strength string help you to take out the earpiece from ear canal easily.

• Mini wireless earpiece  receives signal by inductive coil.  

• across electromagnetic fields  

• Receiving distance: 50-70 cm  

• Standard Zinc-air battery: type 337  

• Battery life: about 5-8 hours  

• Audio bandwidth: from 300 Hz to 4 KHz

• Distortion: <2%  

• Size: 3x5x7mm  

• Working frequency: all frequencies

• Distance between inductive coil and Mini wireless earpiece: about 70-100 cm

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Bluetooth Glasses with Spy Earpiece Set is designed for wireless connection to Smartphone and secret spy invisible earpiece. It transfers clear mono voice to invisible spy earpiece wirelessly. The Bluetooth Glasses has build-in amplifier, you can listen loudly and clearly within 20cm range. Learn More

Main Features: One-touch answering Wireless connection To earpiece < 30cm To cellphone <10 m Bluetooth version: 3.0 External MIC cable length 100cm(only External MIC type) Voice dialing available Battery life 5-6 hours Standby 72 hours Build-in battery 240mAH SN 0000 or 1111 Connectors/Ports - Mini USB (charging Buttons/switches - Volume U - Volume Dow - Power On/Of - Accept/Reject Call Learn More

please note that this is only earpiece, not full set, the buyer should have inductions then can work with this earpiece. if buyer don't have it, then can buy full set in our store. this AMK808 earpiece is perfectly working with our GSM card box. We also have other AMK earpiece models, like 258A, A818, which is the smallest size . if you need any other earpiece, welcome to contact us. Description: Mini wireless earpiece is a micro-mini wireless inductive receiver which transforms audio signal through electromagnetic induction. These products make the covert communication possible when it is inconvenient to expose earpieces. earpiece is widely used in many departments .Using this device;You can hear the voice from the person other side,and the person of the other side can also hear your vioce. Hotspots: Small, light, easy to conceal. Comfortable for wearing with an optimum anatomic design Work principle: Mini wireless earpiece is a one-way reception equipment driven by electromagnetic induction and is used in conjunction with drive equipments, such as radio and mobile phone PRODUCT DESCRIPTION On many occasions, you possibly don’t hope others notice your operating mobile-phone or sth like this. Only 6x10mm(min 5x7mm) the 205 Completely-in-the-Canal wireless earphone is designed to be entirely concealed in the ear canal. It is the ideal device for unobtrusive reception without cables or wires of any kind. It is a new generation of earphone.205 possibly is the tinyest wireless receiver in the world. Virtually invisible when worn, 205 rests deep in the ear canal. The covert Assembly offers the best communications solution at times when secrecy and privacy are of paramount importance. For example, Surveillance, VIP Protection, Investigation, etc. The technical specifications of individual components allow them to be used with a wide range of personal radios. In the professional security field, this new micro receiver will be highly appreciated by security forces and special army units.205 allows you to inform, command and alert your team, without them carrying visible. Learn More